Everyone's afraid of my rabbit.

They're all treating him like he's an aggressive dog; he can't jump on the couch with anyone else other than myself or one of my parents, otherwise they'll dramatically flip, flailing-like, and act as if he's going to go for their throats, despite all he really does is sniff them, maybe hop onto the top of the couch or jump down a few seconds afterwards. They'll sit on the stairs or on the floor ( title floor ) next to the couch where he can't reach them, yet they're absolutely fine with him if I'm holding him or if he's somewhere where he can't really roam.

I've told them an assortment of reactions and approaches to what he may exhibit, he may not like it if you're going around stomping near him, or walking close shortly after a series of loud noises while he's around, notably he doesn't care if people walk slowly and calmly ( which I tell them to do ), and for extra measure, walk a bit away from where he is, if he follows, he's interested and just wants to investigate, most of the time he'll watch you walk by without moving much himself. If you're going around waving a body part in his face, he's going to get annoyed as I believe quick movement scares him and gets him on edge as a result, so if you're going to be near him trying to get his attention, chances are he's not going to be very happy to see you. Ignored are my responses to them fearing that he's going to bite, which he doesn't do much towards anyone else other than me or anyone else that has annoyed / scared him, squeal -- it tells him he has hurt you, the same goes for him while nipping, if he's digging at you, well, ignore him or move a little because he's telling you you're in his way. It feels like they're giving him an impression that he's not allowed to be on the couch, that he's not wanted near them though he's hardly done anything to them ( one of my roommates was once crying just because he jumped over his pen that wasn't fairly high but didn't think he would due to the space he had ). He was aggressive once per his hormones, but I see it has not his fault, he can't control his testosterone as we can, which was the main factor of his aggression. The second he was neutered, he simmered down immediately -- instant behaviour changes yet no one seems to want to see him any different. I've suffered the most of bites and scratches and love him nevertheless, why is it so hard for them?

Maybe you should let them interact with your bunny while you are there. And let them meet him while he’s in the enclosure. Your friends can give him treats and you show them how to interact with your bunny.

For example no fast movements in his blind spot etc.

I know when my bunny was aggressive he wasn’t allowed to meet the rest of the family. It was the same with extremely dominant bunny. Just to make sure none of the family got bitten and built up a fear towards them. Then I later introduce them to the bunnies after their behavior calmed down and was ready. So I was the only one getting bitten and attacked.

Do you know how much your bunny accept to be handled before he might be triggered to bite?

Myself knows all the buttons for my bunnies. So if I see that someone interact wrong or might be bitten, I correct their behaviors and tell what they are doing wrong.