I think what you said is true. But you’re referring to people who have an actual handicap and are discriminated against for it.
What I’m referring to is the idea of allowing myself to believe that a people group are less intelligent than I am just because they don’t align with me politically or ideologically. There is no actual handicap for which they are being discriminated against, simply having a different life experience and different view point is enough. It’s ironically a deeply fascist mentality…and I agree it is everywhere.