This reminds me of a situation I witnessed on Saturday night. I went into The Keep pub in Guildford. A lady in a wheelchair was complaining that the pub wouldn't provide am accessible loo and so her right to use the loo was being denyed. He was asking her to leave.
Shortly she uttered the first word and that was it, she was definitely leaving.
Whether the pub would have space to fit a disabled loo I don't know. It does have male and female loos.
I didn't like to get involved but I would like to have said to the lady she go to All Bar One. They do have an accessible loo but on a Saturday night they stick their resident DJ and his desk sideways on, in front of it.
I understand places not always being able to provide facilities but providing them and then not easy access to them, it is worse.
I've been very tempted to ask to use that loo before, once the DJ had set up but I didn't. For avoidance of doubt, I'm not in a wheelchair but I do have a key for accessibility loos and a genuine need to have such a key.
A for the blind man in question, I don't know how much he can see whether he sit find sitting on the floor difficult, due to this sight. If not then I think that is what be woild have had to do.
I think if someone had asked me I'd have given up my seat and used the floor. I have arthritis, although it's under control at the moment but I'd consider their needs greater.