Our place of work should have almost nothing to do with our personal lives. Also, fuck people who come into the US and don't learn to speak English (though i don't know if the landscapers in question know English or not). But I don't think it's right to fire people for things they do in their free time, on their social media, etc., even when I don't agree with their opinions/behavior. Work life is infringing too much on personal life, and it's a form of thought control because most of us have no choice but to work.