> so this was not meant to be an insult / ad hom?

It's not an ad hominem if it actually explains why their opinion should not be presented as a universal statement, or something that others should police their language by (recalling that the comment began with the command "Stop using the word slop."). I think that's pretty obvious.

> calling anything with genai involvement slop, irrespective of their actual quality, is not intentionally negatively generalizing?

I guess, in the sense that all hyperbolic language can be interpreted as negative generalization? That doesn't mean hyperbolic language is useless.