OMG yeah, totally, you make one racially insensitive comment on a national news radio show, and the for-profit business that employs you lets you go in order to avoid losing advertisers, viewers, and profit! What a friggin' world.
You can argue all day about what constitutes racism versus what is just "insensitivity", but what it comes down to is that any business has a right to fire someone as long as it is not for a discriminatory reason (race, gender, sexual identity, nationality, et cetera). Whether we like it or not, in this time everything that celebrities do or say is recorded. Hell, most of what you and I say is recorded in some way. We all know the kinds of assholish things that you can look like an ******* for saying. Racist comments, sexist comments, rape apologist speeches, admitting that you watched and enjoyed Little Nicky, and I'm sorry, but if you speak like Cowherd spoke and your job fired you rather than lose business to the bad PR, I have no sympathy for you whatsoever.