There are actually two groups you don't like: the ones who greet you when you enter the USA are Customs & Border Protection agents. They have a lot of power. The TSA employees are the folks in blue shirts who screen you &/ frisk you once you're inside the US & trying to fly. As an always-clean-shaven-when-flying US citizen, I have never had the displeasure of being treated poorly by CBP, though I know (and regret) it's par for the course for non-citizens.