I have found life gets a lot more simple when you realize it's okay if some people believe the wrong things about you. I can just let them be wrong and it will be okay.
1. I'm not going to change their minds with words. They will insist on being wrong about me no matter what I say.
2. They don't really matter to my life anyway. They can't get in the way of what I want to accomplish.
3. They will find out soon enough by the way I live my life how wrong they were.
4. I have better things to do with my time than argue with them about their misconceptions about who I am.
And finally...
5. Sometimes it's doggone handy to let people be wrong about me. When people lowball your intelligence estimates, they don't ask as much of you.