I don’t think you need a Mensa membership to recognize that making tells public is a bad idea. He did something in the obviously bad idea category. Obviously bad, to anyone. I’d have to know him to understand why it wasn’t obvious to him, or, of it were, why he did it anyway.
My human nature guess? Exuberance and the desire to be recognized for savvy and cleverness.
You don’t have to be taught that publicizing a tell is a bad idea. You figure that out, yourself. Despite that reasonable expectation, you’re taught it’s a bad idea just in case you don’t figure it out on your own. Hairston flunked at two levels.
BTW, most insightful post here points out that if Hairston knows, Andy Reid’s team knows.