Oh you want to start being a dick now, huh, ok...
If you fire an employee just because they have brown eyes, is a woman, or is a Muslim, they are going to win a wrongful-termination claim against you and draw unemployment off of you:
******
If you remove a customer just because they have brown eyes, is a woman, or is a Muslim, you will be cited by the State for braking Public Accommodation codes.
For example:
When you open your business to the public, you have to conduct 'fair and equal treatment' to each person who voluntarily walks through your door. You cannot deny access to your business just because a customer is one of these protected classes. You cannot refuse to sell to a customer just because the customer belongs to one of these classes. You can't do that now, you wouldn't be able to do that if 'lawfully carrying a firearm' were added to the list.
These laws come from the 14th Amendment. Yes, the 14th gives protections to individuals, from individuals, in addition to protections from the government.
Please, get a clue before speaking.