even though you have no idea what they are doing, and if they are doing what you think they might be doing you have no idea whether it is legal or not. Then posted about it to social media? Including the identity of the business, just to make sure others know that they MIGHT have done something against the law?

Holy crap. Please make sure that when people complain about subtle racism in this country, don't be one of those people that claims it doesn't exist.