Taking off your hat indoors is as an old tradition that's not really practiced by today's generation; much like the tradition of placing one's hand over your heart (or standing at attention, for those of us veterans) when the National Anthem is played.
Before, the People were more akin to exclaim, "America, Fuck Yeah!"
Nowadays, it's more like, "Yeah! Fuck America!"
If you don't like living in America, then participate in the voting process and become an active agent of change. Please do not leave for Canada. Evil Wins When Good People Do Nothing.