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.
yeah... I was a liberal once, and it was definitely informed in large part by wanting to be "good" and correct. I became kind of a debatelord for a minute there. But, what I didn't do, was shit my pants and demand the mods ban them when it became clear I was on the wrong side of something, I lived and learned and moved on (generally leftward). You gotta be able to take the L sometimes.
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Or even an embarassed angry loss, as long as you have the self restraint to shut up about it when you're too upset to engage critically and not just react. I've had plenty of those, some on this very website. Once I caught a ban from a comm, and you know what? I was pissed about it, but I just made a new account and moved on. And looking back I think they were mostly right. The key is to not shut your brain off at the first sign of conflict.
I know it's not exactly a new observation, but I think that on the internet, bad faith and snark is more or less an assumed default, which incentivzes people to take maximalist positions and never back down even a bit, because posting has become such a zero/sum game.