I use a forum with a ‘not like’ button, and it causes a lot of problems. People press it without saying why, so the OP has no idea whether it is because the post is factually incorrect, the presser disagrees, the topic has been discussed before or what. It adds nothing to the conversation, and can be a thread killer.
Some posters are followed about with ‘thumbs downs’, as they have upset others who ‘gang up’ on them. There are those who want to ‘make a point’, but can’t be bothered to actually make it, so just click ‘thumbs down instead and hide behind that.
It seems to encourage ‘cliquey’ behaviours, as others get lots of ‘likes’ whenever they post, and there are regular calls for the facility to be removed.
People get upset and feel hurt, so you get accusations of bullying. I don’t think it’s bullying so much as cowardice, but it must be awful to see 37 ‘dislikes’ and very few constructive comments, which does happen.
Threads get derailed when dislikes appear on a reply post (usually one where the poster announces that they haven’t read the rest of the thread, then posts advice that has been discussed several times before), gets huffy and asks why. Subsequent posts are then about how it’s rude to butt in without reading, the OP’s post gets lost , she complains, and so it goes on.
You can’t please all of the people all of the time, I suppose.