Well, who decides what are "good manners"? And should having an 'aversion' to someone be grounds to 1. act rudely to them, and 2. refuse their business? There are things people do every day that I'm averse to (like talking loudly on cellphones) but I put up with it (or not, sometimes if it's really annoying I'll say something). And, these things, these 'standards' are variable. For example, some cafes allows dogs. I actually think/feel THAT is a little unhygenic, but not to the point of freaking out. Just kinda odd.
Again, we're talking about a couch in a cafe. To me, that invites getting comfortable, including putting one's feet up on it in shoes. I know that may not sound ok in Europe, or parts of the US, but it's fairly common, at least in some cafes. So, if bad manners it the arugment, ok, fine, but again, who decides? And will the young baristas have some kind of training about what is manners? And will the enforce good manners equally? For example, I'm in a cafe right now and some guy is just reeking of body odor. Is it kinda gross? Yes. Do I really effing care? No. Do I think it's probably bothering others? Yes.
At a deeper level, I'd question people's willingness to just conform to what society wants. Society thinks we shouldn't say anything about our country bombing other people in other countries. 'That's just the way it is. That's what the CIA does.' I'd say our government and their corporate overlords LOVE to hear people just going along with what society wants.
Ok, that's my rant. Flame on!