I know why people say this but I also hope people know why this is a bad idea. The angry reaction works because it's hostile in a melodramatic way. If you angry react to someone's post, it risks making yourself look kinda like, trolled and silly, and essentially says more about you than it does about them. You don't want a reaction option that feels like successfully getting one over on the recipient without them having a chance for counterplay.
@sstronaut I like how it works on Discord: pick any emoji, or multiple ones if you want. Although that much freedom may make people react instead of reply, which is good in a busy chat but maybe not on SW.
