Just go ahead and conflate outright tankies and ML's with the entire communist space, sure, whatever. You ended up with "Communists want to take your toothbrush" level of analysis just because you paint too broadly.
The problem with liberalism isn't that they champion liberty, it's that they are woefully incapable of challenging systems of power, and that just enables the present biases and power imbalances in the system, ultimately always leading to fascist tendencies and sometimes an actual slip into fascism.
And that's the beef the communist community at large has with liberals. They would theoretically be an ally, but will actually align with the fascists more often than with socialists/communists because they know fascists will ultimately still preserve upper class business interests.
I won't say that your critique isn't salient, it does fit in with what a lot of tankies seem to believe, as they regularly champion state power, but it always irks me when people only interact with online jackasses and then assume that all people who subscribe to a similar ideology share in those opinions.