It's not about individual comms, and there is, of course, a place for being silly. The problem is that the "silliness" "spreads" to the entire site. Look at how people are "arguing" against Roderic's point on the hexbear thread about it, in what's supposedly a comm for critiquing bad takes. Most of the comments are random jokes, and most of the actual written out ones are blatant lies, strawman arguments, or similar (some of the really bad ones did get removed as far as I can tell). The same exact tactics anti-communists regularly use to shit on AES states or our ideology in general.
The actual origin of it is western anti-intellectualism which we have to overcome in our organizing. Of course hexbear won't be a vanguard, but we're not doing our job as communists if don't fight against these tendencies.