The answer is obvious. If a conservative uses such words, it would be hate speech and illegal. If a Democrat/leftist says the same thing, it is a lawful exercise of free speech. Selective enforcement would be a dream for the Marxists.
Leftists love laws that are ambiguous,
it’s a force multiplier for them.
They are able to use “discretion” about when something is “threatening language” and when it is not.
And you’ve already stated the obvious - conservatives speaking will always be “threatening” and liberals will never be threatening.