You do not have First Amendment Rights while you are at work.
In my small town at the city hall a black female employee wore a I can’t breath shirt to work and another employee who’s brother and nephew are police officers objected. It resulted in a large shouting match. All could have been avoided if the office manager had told the black employee that is not appropriate for work, no political slogans, go change now.
Unless you're a professional sportsman, an enemediot, a Hollyweirdo...