More irrelevance.

There would be no reason to quote them, period.

No reason not to either, logically.

choice of who to quote taint them themselves

Genetic fallacy: your “taint” concept is irrational. Again, sometimes a quote is brought up for the idea it expresses rather than who said it.

Like here: the commenter merely wrote that person is known to have said something relevant to the topic. Instead of addressing the substance of that message they’re referring to, you’re getting distracted by who said it.

stop quoting fascists if you don’t want people to think you’ve decided to label yourself as a target for righteous violence

ad baculum

Stop pretending your high school debate classes are real life

Start meeting basic standards of logic that don’t fail high school?

How about “respect logic”? It’s pretty simple.