I don't think an angry face will detract from any overall like totals or anything like that. The closest thing to a dislike on the site is the downvotes on threads with questions (I think these threads get the voting thing) and posts in this forum.
Again I don't think these downvotes are detrimental to any user stats, they just serve a purpose in their relevant uses.
Well the like total was replaced with a "reaction score", so I think any reaction would add to that? I think we'd have to wait for an admin for official confirmation on that one, but that makes sense to me.
I do agree things like a laughing react are a good thing to avoid smaller posts that don't add to the conversation.