To me, it's a similar situation to when I worked in a store, which was close to a college that had many blind students.
Now we were cool with that, we're not dicks, and wouldn't make fun of them.
However, one of them was just awful, rude, he'd play on his status, wandering thru queues to stand at the front, saying 'oh I cant see, didn't know there was a queue', that kind of thing, as well as being condescending to the staff, and demanding lots of attention.
I ought to state we got on well with some of the helpers, and found that he wasn't fully blind, and was capable of getting around town on his own, was more seeing in blurs of colour instead of clearly. (sheesh even now I'm feeling like I'm picking on him).
Of course, anyone with a disability, you feel like you should try to help, and they're better people for learning to live with the hand they were dealt, but, when you're handling a good 50 or so blind customers a week, and ONE is being a dick on a regular basis, you're not discriminating against his blindness, you're against his personality, imo.
Of course we had to be so careful, because to any outsiders, all they'll see is store staff not being sympathetic to a blind man needing help, and ohh...would he play it up if he felt he wasn't getting the attention.
But, yes, like a bully who dies, social graces seem to dictate that you can't treat a dick like he deserves, because of how it appears to outsiders. You are entirely in your rights to still hate him for making your life worse, and even be happier that he's gone for good, but you can't go public with those feelings, I think.
Just like the way we'd try to do the minimum for him, while going out of our way to help the others. (As another example, he'd travel across town, come to our store, then ask to listen to a cd to see what it was like, then he'd need one of us to lead him over to the listening post with the headphones, and after 4 years of negotiating the town, and store, he still wanted people to take him by the arm and lead him the 10 feet. Again sounds mean, but it's infuriating to do it when you feel like he's just playing it up.)
It was an unofficial rule really however, if someone came in and said 'I'm sorry, I seem to have bought this cd as a gift and my daughter doesn't like it' we'll change it, we'll suggest other music, we'll offer a refund, whatever. If however, they come in and go 'I bought this and it's SHIT, what are you fuckers going to do about it, I know my fucking rights!!' then you're gonna get the bare minimum we can possibly legally offer.
Anyways, sorry to ramble and go sort of off topic, but I felt it was sort of relevant, kind of like the comedian who said 'who says minorities can't be ignorant, irritating fucks too?' (wish I could remember who!).