Apparently, there's at least one team in the MLS that forbids fans from wearing a "Make America Great Again" hat. A man who identified himself as Michael Weitzel recently shared a video of him being "asked to leave" Energizer Park,

A Major League Soccer fan was abruptly escorted out of a stadium for sporting a ‘Make America Great Again’ cap. The fan, who identified himself as Michael Weitzel, filmed himself as he was “asked to leave” by the stadium’s security.