As someone not from the USA, I'm mystified by the implication that wearing a political party hat (the currently elected political party at that) makes a place u

As someone not from the USA, I'm mystified by the implication that wearing a political party hat (the currently elected political party at that) makes a place unsafe. And not even wearing it at the event, but at some place else, some time in the past. I'm glad that brilliant people like Uncle Bob mention how... strange this stuff is.