I feel like I’ve been judged by a Christian stranger that knows nothing of me.
Feeling are quite untrustworthy as they are often bigoted by the feelings of any individual worldwide and are quite deceptive. You know that. Only Jesus Christ judges all men after death and He judges by whether or not they believed How that He was crucified for our sins and rose again the third day. No works, no boasting allowed as it was His work at Calvary that purchased salvation for sinners. No other works accepted by God the Father, as the Scriptures teach all who read them and they are written by holy men of old as directed by the Holy Spirit of God.
Don't be childish and take it personally as if he was speaking directly to you.
My issue is that many who speak like him often turn out to be fire and brimstoners who misinterpret the Bible and the difference between the Old and New Covenants.
If you feel some resentment, then add your interpretation of what you see/hear and relate it to Scripture - never hurts to see differing opinions and taking the time to bump them against Scripture for relevance/context - that's how many of us learn more about our Savior.