No, Road Runner you cannot deny people service for a variety of reasons.
Can a public business deny service to a customer?
"... there are important limitations. In the United States, businesses have the right to refuse service to anyone, but they cannot do so based on discrimination against protected classes. Federal laws, such as the Civil Rights Act of 1964 and the Americans with Disabilities Act, prohibit discrimination based on race, color, religion, sex, national origin, disability, and other protected characteristics2.
Businesses can refuse service for legitimate reasons, such as dress code violations, disruptive behavior, or health and safety concerns, as long as these reasons are applied consistently and do not discriminate against protected classes. For example, a restaurant can refuse service to a customer who is causing a disturbance, but it cannot refuse service based on the customer's race or religion2."