Tbh I don't think I have ever used the word 'dialectics' unironically. To me it's mostly just a funny meme word, and actually talking about dialectics doesn't really require using the word. I think the abuse of 'materialism' is a much more real harm though, because it can lead to some awful takes like 'being trans is not materialist, but idealist and therefore bourgeois', generally ignoring that the superstructure is actually a real thing that exists and has to be grappled with, and probably a lot more i can't think of off the top of my head