The irony of your question "What makes you think you understand their experiences?" is precious!
So is your apparent belief that intent is magic. As a reminder, here's your comment, followed by my reply.
Maybe you are seeing hatred in places it does not exist?
Maybe you should open your eyes a little more? Are you short? Old? Rich? Fat? Female? What makes you think you understand their experiences?
Now, perhaps you're not smart enough to understand that my reply was directed to the quote that immediately preceded it. Perhaps you don't realize this: at no point in that quote were you attempting to portray the experiences of short/old/fat/female/other disadvantaged groups. Perhaps you don't get how what a comment responds to can alter the meaning of that comment.
So, I'll rephrase for you:
Maybe you are seeing hatred in places it does not exist?
Maybe you should open your eyes a little more? Are you short? Old? Rich? Fat? Female? What makes you think it mattes whether actual hatred is behind the actions that disregard, demean, disrespect, discount, and discourage people in disadvantaged groups?
Clearer now?
When I point out numerous examples of how segregation can exist without contempt and inferiority, you call that a smoke screen?"
No, I call that you being completely clueless and unaware of the the actual experiences of people, the research that has been done, and the general aspects of human behavior whenever group divisions are formed. I only used "smoke screen" on the particular issue of roller coasters and short people, because I made a guess that you are not a roller coaster engineer and don't regularly read literature on roller coaster design, so you don't really have an knowledge of the degree of prejudice versus necessity in roller coaster manufacturing (neither do I). Feel free to correct me if I am wrong in that assumption. Absent knowledge, neither of us can do more than shrug our shoulders at it.
For example, It may be that it would be impossible to design a sufficiently secure harness for the general public that can cover people that are 7 feet tall or 4 feet tall (yes, you can be too tall for these rides if the harness does not latch). My expectations would then be that the harnesses are made to cover most of the public. Similarly, if it is necessary that, say, a firefighter be able to carry 100 pounds on their shoulder, I have no issue with that standard being set, even if it means fewer women will be firefighters.
So, on that one issue, I punted because I didn't know what I was talking about, and AFAICT, neither did you. On every other issue you mentioned, I pointed out the problem with your depiction (the notion of the rich as disadvantaged is quite amusing, by the way). So naturally, you focused on the first. I guess you have nothing else but ignorance to carry you along.
It is called disproving your thesis, dude. And by making your thesis categorical and unnuanced, this is like shooting fish in a barrel.
Then I suggest you take better aim. So far, you're missing the barrel.