You can't figure yourself out.
Mmmhmm.
You're a small, insignificant man in a big world who is well aware of his rather large amount of shortcomings. As a result, you find it necessary to make yourself feel better, smarter and grander by challenging people on their education and professional credentials whenever you feel threatened by them because you don't have any of your own.
You become deeply aware of your shocking lack of education and professional experience and as a result try to make others look like we don't have the credentials we actually have earned. So you strike out at us, call us liars, tell us to prove our credentials and even when you are given the opportunity to find those credentials for yourself you refuse to do so because you're aware it will make you feel that much worse about yourself.
So I'll now apologize to you for being cruel to you and offer you my pity, because nobody who feels so bad about themselves as you clearly do should be abused.
Instead, going forward, I'll just pretend you don't exist at all.