White UA is the New MAGA Red

This happened about a year ago in the Uptown district of an upper midwest metro area (USA). My (49m) roommate (38m) went to the local grocery chain. We are both fairly a-political moderates who vote in elections, but would rather watch Disney or play video games than binge watch the media news stations.

Both of us were wearing gym attire, having just finished a workout. He was sporting a backwards white Under Armour (UA) baseball cap cause his hair was mussed.

As we were walking into a store, this guy in his late 20s/early 30s came up to us and randomly says to my roommate, "Nice baseball cap -- you must be a Trumper. You voted for him, didn't you?" My roommate is extremely non-confrontational and muttered under his breath, "Whatever" He told me later, he hadn't really heard what the guy had said to begin with, and just wanted to get away.

Unfortunately, the nut job took that as an affirmation and got in his face blaming him for all the ills of the world. We walked around him and into the store, but the guy kept following us accusing us of being Trumpers who weren't welcome in Uptown. I finally had to track down a manager and ask him to get the guy to leave us alone.

We ended up getting the bare necessities for dinner, paid for our groceries and left.

I'm still trying to figure out how a white UA baseball cap gave off the impression that we were Trumper.

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Edit: Spelled out Under Armour (UA)

Edit 2: added hyphen in a-political (non-political)