What do you think could be a reason why I truly believed growing up anybody who I thought was ugly looking must also have an ugly personality?

As a young child and through my teen years as well I really did believe and honestly thought anybody who I thought was ugly looking must also have a bad and ugly personality as well and it would be good for me if I didn’t try to be friends with them and stay away from them.

What do you think could be a reason why I truly believed growing up anybody who I thought was ugly looking must also have an ugly personality?
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