Yes I do. My life experience has taught me many things. One of those is that I can trust my gut. If someone gives me the creeps and I feel uneasy around them, I don't deal with them or I am very cautious in my dealings with them. Nothing wrong with a little discrimination IMO.
I, like everyone else on this planet have been discriminated against because of this or that. And it has taught me alot. I've learned to accept rejection gracefully. It has inspired me to work to change negative perceptions of me. And I've learned that I have a right to reject someone based on my feelings and I don't have to feel guilty for not loving every one. If you have a favorite anything (color, dog, religion, friend) then you discriminate.
Yes, people do change. It's called experience. None of us act as like we did as a kid or teen. Life changes you, your actions and reactions. If it doesn't then obviously you don't have the capacity to learn from your mistakes.
And steer clear of anyone who says they don't discriminate. They are lying. And you will probably have to spend alot of time and energy reassuring them they are above everyone else.