I feel your pain. I was single through my 20s and 30s. As time went by sleeping arrangements used to really piss me off. For example at weddings or group holidays people seem to think it is ok to put a single person in the same room as another single person. But a couple sharing a room with a stranger — unheard of!
I’ve been with my now husband for 12 years but I still identify strongly with single issues. I try hard not to dish out that poison. And if there are times that I have unwittingly failed to do that, I deeply apologise.