The huge emojis is a lemmy bug, one which has basically been fixed (at least the lemm.ee admin seems to have fixed it, I imagine he's pushed the code to the main stack but others won't necessarily have adopted it yet).

I remember seeing a bit of a burst of them interacting with stuff when they first federated, but since then it died down massively - and not just because they'd been defederated, but in the threads they were still a part of. The novelty quickly wore off and users on both sides started noticing where they were posting more (hexbear users when they step out and lemmy users when they went in to hexbear) and behaving accordingly. Frankly, I've seen far more posts spamming moans about them than actual things to moan about.