Used to go out with a lass the same - 2 of those leg brace things and worked for the Courts service. Refused to simply stop working - here's a thing - a Doctor said "Why are you working when you can make as much through being on DLA?" - so the Dr's are saying this to her (about 10 years ago now) so why would people want to work? She did - much in the same vein as your mate - my uncle, on the other hand, is one of those "Registered disabled, fat bastard lazy twats" you talk about - he's deaf FFS and massively overweight (type 2 diabetes due to it) and he had an operation so he has a hearing aid constantly and can hear as well as you or me - yet he complains about everything like the world is terrible on him and has been on the sick for 8 months after having a STENT fitted (my dad returned to work after 3 months after a triple bypass!) boils my piss (he's only 45 year old BTW - not in his 60's like my Dad is!)That's it mate, people abusing the system because it's too soft.
I can't stand people who go to any length to avoid work, but the people who allow this to happen are a million times worse.
I train with a fella who wears the Forrest Gump style leg braces, he's there every day, busting a gut and then straight to work, even though he's entitled to disability benefits and all sorts which would allow him to sit at home on the slack, doing **** all.
He's worth 100 of them fat bastards who spend their days hoovering cake, they disgust me more than anything else.

..