I lived in a town in the early 90’s where the nastiest guy in town WAS handicapped.
Was in a wheelchair and had a modified van which he drove. He was the self-appointed town enforcement agent for handicapped parking violations. If a non-handicapped person parked there he’d wait for them to come back and scream bloody murder at them. If the handicapped parking sign blew down in a storm he’d be in threatening the business owner with lawsuits and a Federal investigation.
If someone had a crack in their sidewalk that made his chair go bumpy he’d have them cited.
Some people are just nasty. Whether they have working legs or not.
Was the guy’s handicap the result of a birth defect or did he suffer some sort of debilitating injury? Either way, it sounds like a case of ‘Poor Me Syndrome’.