I have no data here, just posing a question. I think it would be an interesting hypothesis on which to run a survey.
Personally, I've found that self-limiting beliefs have held me back in a number of areas — especially around confidence. Breaking past those has been very important in my life.
Every study of confirmation bias. If you see yourself as an outsider you look for evidence of it and it becomes your worldview.
Alright, but how do you determine it isn't a justified belief?
The real question is: how would you ever know if it isn't?
Here's the problem though - how do people determine that they're suitable judges of whether someone is marginalised or not?