Well there are A-holes all over this world, we just can't get away from them completely. Some people feel small and ugly inside (maybe didn't feel truly loved as a child?) and the only way they know to try to feel more important is by making others feel bad. If they don't say mean things to you, they'll just pick on the next person who comes along, anyone who looks at all different than them will do.
How sad it must be to be like that, all those bad ugly feelings churning around inside like a nauseous stomach. Just feel sorry for them if you are able- and be glad and grateful you don't have to BE them!!