Replies on Mastodon seem to come 80% from the kind of folks that panic when a conference call is ending and they realize they haven't spoken, so they just think of anything at all to say in order to participate. Or folks who submit formatting nitpicks to a code review just so everyone can see they didn't rubber-stamp approve.

They aren't offensive trolls like on Twitter, it's more well-intentioned and sincere but also totally irrelevant and annoying.