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.
Yes the way we form our beliefs and vocabularies is largely contingent on our experiences and sources, be they Thomas Kuhn, Michael Parenti, or Tucker Carlson.
That's what these look like from the outside, but from the inside they look like, and for all intents and purposes, are, eminently reasonable and defensible justifications for thinking the things they think. In certain meaningful ways, we don't even live on the same planet as them.
How do they know this? We know this, but I don't think we can assign this knowledge to them. If we ask them this, their just as likely to say it's regrettable, but on consideration, morally preferable to the alternatives.