You can sue, but not likely you would win. If they refused to serve them because they were fat, they might have a discrimination suit.
you can discriminate for a good reason, a bad reason or no reason at all as long as its not an ILLEGAL (ie race sex, gender, national origin, age or disability) reason. Being a porker is not a protected status nor should it ever be
You can refuse to serve a porker at a restaurant because they are a porker? I don't know about restaurants, but I think being a porker does have some protected status.
Weight Discrimination Laws Laws in Place
Michigan is the only State with law prohibiting discrimination against overweight peopleEnacted in 1977. The Elliott-Larsen Civil Rights Act prohibits discrimination practices based on 10 categories, including weight.
Cities
Washington, DC: the Human Rights Law includes “personal appearance” in its protected categories.
San Francisco, CA: the Human Rights Commission added “weight and height” to the municipal code to ensure that pro-grams, services, and facilities would be accessible.
Santa Cruz, CA: the municipal code on discrimination includes “height, weight, or physical characteristics” as protected categories.
Binghamton, NY: the municipal code on discrimination includes “height, weight, or physical characteristics” as protected categories.
Urbana, IL: the municipal code on discrimination includes “height, weight, or physical characteristics” as protected categories.
Madison, WI: the municipal code on discrimination includes “height, weight, or physical characteristics” as protected categories.
Legislation Awaiting Action
Nevada Bill AB166 awaiting action adds “Physical characteristic” which means any bodily condition or physical attribute of a person that is a result of birth, injury, disease or natural biological development, including, without limitation:
(a) Height;
(b) Weight; and
(c) Physical mannerisms beyond the control of the person.
NAAFA-Laws in Place