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Is an insult only a venial sin? Often it would be. But if the insult is said to anyone with malice, it is an actual mortal sin, no matter how slightly worded. Malice is always objectively grave, as it is incompatible with the state of grace, which is the state of loving God and neighbor. When chosen with full knowledge and full consent of the will, it is an actual mortal sin.

What you should be concerned about is your own soul.
Remember Haman. Flee antisemitism.

Esther 6:13
And Haman told Zeresh his wife and all his friends every thing that had befallen him. Then said his wise men and Zeresh his wife unto him, If Mordecai be of the seed of the Jews, before whom thou hast begun to fall, thou shalt not prevail against him, but shalt surely fall before him.

Ezekiel 36:

Moreover the word of the LORD came unto me, saying,
Son of man, when the house of Israel dwelt in their own land, they defiled it by their own way and by their doings: their way was before me as the uncleanness of a removed woman.
Wherefore I poured my fury upon them for the blood that they had shed upon the land, and for their idols wherewith they had polluted it:
And I scattered them among the heathen, and they were dispersed through the countries: according to their way and according to their doings I judged them.
And when they entered unto the heathen, whither they went, they profaned my holy name, when they said to them, These are the people of the LORD, and are gone forth out of his land.
But I had pity for mine holy name, which the house of Israel had profaned among the heathen, whither they went.
Therefore say unto the house of Israel, Thus saith the Lord GOD; I do not this for your sakes, O house of Israel, but for mine holy name's sake, which ye have profaned among the heathen, whither ye went.
And I will sanctify my great name, which was profaned among the heathen, which ye have profaned in the midst of them; and the heathen shall know that I am the LORD, saith the Lord GOD, when I shall be sanctified in you before their eyes.
For I will take you from among the heathen, and gather you out of all countries, and will bring you into your own land.
Then will I sprinkle clean water upon you, and ye shall be clean: from all your filthiness, and from all your idols, will I cleanse you.
A new heart also will I give you, and a new spirit will I put within you: and I will take away the stony heart out of your flesh, and I will give you an heart of flesh.
And I will put my spirit within you, and cause you to walk in my statutes, and ye shall keep my judgments, and do them.
And ye shall dwell in the land that I gave to your fathers; and ye shall be my people, and I will be your God.
I will also save you from all your uncleannesses: and I will call for the corn, and will increase it, and lay no famine upon you.
And I will multiply the fruit of the tree, and the increase of the field, that ye shall receive no more reproach of famine among the heathen.
Then shall ye remember your own evil ways, and your doings that were not good, and shall lothe yourselves in your own sight for your iniquities and for your abominations.
Not for your sakes do I this, saith the Lord GOD, be it known unto you: be ashamed and confounded for your own ways, O house of Israel.
Thus saith the Lord GOD; In the day that I shall have cleansed you from all your iniquities I will also cause you to dwell in the cities, and the wastes shall be builded.
And the desolate land shall be tilled, whereas it lay desolate in the sight of all that passed by.
And they shall say, This land that was desolate is become like the garden of Eden; and the waste and desolate and ruined cities are become fenced, and are inhabited.
Then the heathen that are left round about you shall know that I the LORD build the ruined places, and plant that that was desolate: I the LORD have spoken it, and I will do it.
Thus saith the Lord GOD; I will yet for this be inquired of by the house of Israel, to do it for them; I will increase them with men like a flock.
As the holy flock, as the flock of Jerusalem in her solemn feasts; so shall the waste cities be filled with flocks of men: and they shall know that I am the LORD.

The Church and non-Christians

839 "Those who have not yet received the Gospel are related to the People of God in various ways."325

The relationship of the Church with the Jewish People.

When she delves into her own mystery, the Church, the People of God in the New Covenant, discovers her link with the Jewish People,326 "the first to hear the Word of God."327 The Jewish faith, unlike other non-Christian religions, is already a response to God's revelation in the Old Covenant. To the Jews "belong the sonship, the glory, the covenants, the giving of the law, the worship, and the promises; to them belong the patriarchs, and of their race, according to the flesh, is the Christ",328 "for the gifts and the call of God are irrevocable."329

840 And when one considers the future, God's People of the Old Covenant and the new People of God tend towards similar goals: expectation of the coming (or the return) of the Messiah. But one awaits the return of the Messiah who died and rose from the dead and is recognized as Lord and Son of God; the other awaits the coming of a Messiah, whose features remain hidden till the end of time; and the latter waiting is accompanied by the drama of not knowing or of misunderstanding Christ Jesus.