Yes, the confused emote as well as the sad emote are often misused as passive-aggressive reaction methods. We really don't need those.
A like emote is enough to show support. If you disagree, simply don't "like" the post and state your disapproval in a response so that the person understands why you disagree with them - and perhaps an interesting discussion can grow out of that.
As for the laugh emote: If someone cracked you up with a comment, you can react in a response - no need for this anonymity system here, either.
P.S. Also, what's up with emojis like this one? -> 💩