Black Lives Matter T-shirt is a Political Slogan END of statement. Doesn’t matter if the Black people can not be discriminated against for skin color. The would be removed for the SHIRT if they didn’t wear the shirt they wouldn’t be removed.
If a Black person wore a MAGA hat or a Confederate flag shirt do you think they could be denied service because of the hat or shirt it wouldn’t be seen as racists.
But once you put on a Shirt like Black Lives Matter then they can not be removed?
What about the places that refuse to server officers while in uniform? They have every right too refuse service.
You are the issue you seeing Black Lives Matter linked to Race only and not just a slogan on a T-shirt that can instigate issues in an establishment.