I know when MN introduced the reaction button which included the Laugh emoji a lot of posters weren't happy about it. And there have been various comments by posters about its misuse.
It is just being used so commonly now to mock and deride serious comments that are in no way funny. That can no way be interpreted as light hearted.
It would appear to be being used to try and drive posters off threads. And the impression I get is that it's actually often certain posters ganging up together to try and silence people who don't agree with them.
I think MN having guidelines for posters to stick to civilised responses to other posters is being undermined because they have given those who are minded to be unpleasant to other posters the perfect tool to be nasty to them without having to verbalise anything and risk getting their post removed.
I'm failing to see any benefit in providing the laugh emoji reaction when it's principal use now is to upset and drive away genuine posters.
I don't think it was a good idea in the first place and I would like to see MN remove this reaction option.