Picking Nits
Lots of business do in fact discriminate against gun owners. There are thousands of business across America that post signs saying no guns allowed. That is the same as a business posting a sign that says "no gays allowed" or "no blacks allowed".
Both of us know full well the meaning of "discrimination" and the difference between those things that are legal and those that are not. Your reply is totally devoid of accuracy as it applies here and you are simply playing with semantics for its own sake, arguing for the sake of arguing. Legal actions are decidedly
not the same and those prohibited.
Discrimination = action or policies based on prejudice or partiality.
discrimination
n. unequal treatment of persons, for a reason which has nothing to do with legal rights or ability. Federal and state laws prohibit discrimination in employment, availability of housing, rates of pay, right to promotion, educational opportunity, civil rights, and use of facilities based on race, nationality, creed, color, age, sex or sexual orientation. The rights to protest discrimination or enforce one's rights to equal treatment are provided in various federal and state laws, which allow for private lawsuits with the right to damages. There are also federal and state commissions to investigate and enforce equal rights.
See also:
civil rights
http://dictionary.law.com/Default.aspx?selected=532
A No Guns decision by a private property owner is no different than their deciding "No Shoes. No shirt, No service" = not illegal, completely within their rights.