Here's an example, how about instead of "X should die", it's "lol, can all X just die?". They give it a little jocular spin with the "Lol", but it's effectively the same comment.
Here's the deal: if X in that comment is "black people", you get banned on Twitter. If it's "white people" you don't get banned.
Now personally, I don't mind the comment in either form. I don't believe it's an actual threat to anyone. It's kind of edgelordy, but whichever. And beyond that, I'd be very unhappy if someone got banned for something like that, because it just stomps over whatever other, more legitimate commentary they might've had.
I'm interested in having conversations, even imperfect ones. All conversations are imperfect.
But OK, let's move past "X should die".
But it's not just that. Any discussion where one side can be spun as a vulnerable minority (merit be damned), that minority status can be used to silence the other side.
So for example, consider transwomen in women's sports. There's a not-insignificant push among trans activists to claim that transwomen are "biologically female". I think the logic with that is: 1. sex is fuzzier than most people realize (debatable) and 2. hormone treatments are sufficient to tip someone over the line into the other biological sex (also debatable).
Referring to a trans woman as male for the sake of argument runs you a serious risk of getting permabanned from Twitter if the person you're arguing with is particularly ornery.