Don't waste time debating these loons. Just go to Whole Foods, spend money, and speak polite English.
"Thank you, sir, you have been most helpful."
"Excuse me, boys and girls, but politically correct language is deeply offensive to those of us who are sane."
"We respectfully oppose the tyranny of a tiny minority and will continue to exercise our free speech rights."
"May I suggest that you re-locate to Canada?"