Wiki - The paradox of tolerance states that if a society is tolerant without limit, its ability to be tolerant is eventually ceased or destroyed by the intolerant. Karl Popper described it as the seemingly self-contradictory idea that in order to maintain a tolerant society, the society must retain the right to be intolerant of intolerance.
But the right's problems are things like "black people exist" or "trans people exist", or really just a bunch of variants of that for different people they hate. The Nazi comparison isn't invalid, and there's absolutely no reason for the left to entertain their problems as legitimate.