On another forum I read, they have specifically requested people NOT make a reply with only an emoji, or just "thanks" or "I agree" etc.
As I understand the reasoning, it's because this means many additional posts which creates a heavy digital storage burden (unsure if that's admin workload or cost of server space). I think they even added additional response emojis to make this easier for participants.
Personally I want to see the laugh response emoji back, and if folks persist on belittling other posters, whether it's via laughing at them or any other way, they should be warned/punished/banned/whatever is deemed appropriate. It's the making-fun attitude that is offensive, not the specifics of how they do that, and punishing everyone else for their bad behavior isn't the right approach.
MOO, of course!