While their behavior was entirely legal and protected by the First Amendment, the problem lies elsewhere. It's in the utter lack of tolerance to the views not conforming to the group's, not unlike the reaction religious extremists would display.
Can't help but quote:
--
The Emperor summons before him Bodhidharma and asks: “Master, I have been tolerant of innumerable gays, lesbians, bisexuals, asexuals, blacks, Hispanics, Asians, transgender people, and Jews. How many Tolerance Points have I earned for my meritorious deeds?”
Bodhidharma answers: “None at all”.
The Emperor, somewhat put out, demands to know why not.
Bodhidharma asks: “Well, what do you think of gay people?”
The Emperor answers: “What do you think I am, some kind of homophobic bigot? Of course I have nothing against gay people!”
And Bodhidharma answers: “Thus do you gain no merit by tolerating them!”
-- (http://slatestarcodex.com/2014/09/30/i-can-tolerate-anything...)