Every liberal does it too, from center right radlibs to far-right "conservatives": the most extreme right fringe liberals hate the mainstream liberals for not being bigoted enough, the mainstream libs hate the radlibs for not being cruel enough, and the radlibs hate the left for not being chauvinist enough.
Denouncing chauvinism in particular is like a liberal moral event horizon, a cardinal sin against their self-interested belief in the righteousness of the imperial hegemon that keeps the treats flowing at gunpoint.
Ughhh. This one really kills me, because usually it's cis people saying this to trans people, telling them that they're wrong. Like, would you do that to someone of a racial minority who told you something you said was a slur? Probably not.
I've even seen people say that their "transwoman friend" [sic] said it was okay. As if that makes it okay for everyone. It's like they think they have some kind of weird "misgendering pass."
Their trans friend who is just trying to make sure they don't turn every single social relationship they have into an uncomfortable battle and is probably capitulating because it's easier rather than dealing with their shit.