I think we all have at least one. Some person, maybe an uncle or aunt or cousin, maybe a parent or sibling if you're particularly unlucky, who has this one very fixed impression of you as a person. That impression doesn't change no matter what you accomplish and no matter the opinions of those who know you best. Maybe they see you as the baby, or the slacker, or just the one who doesn't like peas. They will continue to believe these things about you regardless of how many plates of peas you shovel down in front of them. No matter where your life takes you, this person will insist on dragging you back to the moment at which they've decided you live. Professor X has someone like that too.