Yes. And they are free to fire him and he is free to leave. At least he is making it clear to many what leftist a-holes they are.
If I worked for Planned Parenthood and disagreed with their support for abortion then I don't think I'd sit and write letters. I'd leave and go to work for someplace that didn't turn my stomach. If this guy is so completely opposed to the idea of a LGBT month then why support the company that is sponsoring it? I've got news for him. Minimum wage jobs in retail aren't that hard to find.