Your view is manifestly incorrect. There are so many groups of people that are looked down upon, what you describe is just a tiny tiny subset of these. If you are grasping to find an example, that shows a great deal about your position in life.
(If you still struggling, start with sex workers, people working in waste management, and people with physical disabilities, aka 'hookers' and 'trash people' and 'cripples'. Yeah, they definitely not looked down upon. LOL. I could literally write 10 pages of further examples.)