Exactly... I work at a university. Can you imagine what would happen to me AND my car?
But, like in the two previous presidential elections...we have professors walking around with THEIR politics on their T shirts.
Use your phone. Tell them you would like a picture! It could come in handy later. No need to let them believe you are not on their side. There may just be a “later” they regret.
So if they are wearing t-shirts, then you wear a t-shirt with your message. They can’t object then.