See this is a trope I increasingly do not get, discrimination usually targets the weak, the helpless, the vulnerable, such as the economically disadvantaged or minorities. Superhumans don’t neatly fit into that stereotype, for one most or at least enough of them have really useful superpowers that makes bullying or even provoking them extremely hazardous to even a mob of us normal humans and bullies tend to be natural cowards.
Superhumans are much more likely to become an ultra wealthy elite and/or celebrities than they are to openly be discriminated against. Really the most likely oppressors and bullies of superhumans, particularly in a modern or more advanced setting are other superhumans, not the general public.
This article explains it better than I can, at short notice anyway, under the X-men heading
Ahem, sorry for the sidetrack and of course authors are free to write what they want to write about even if it is a trope I find increasingly jarring the more superhero stories, comics and movies proliferate in the mainstream as of late.