Mike Huckabee doesn't want you to use the term "RINO."
That's probably because he is getting tired of being called one... and that because he IS ONE.
To be fair, I've urged the discontinuance of the term in recent years myself, but for different reasons. Huck doesn't like the word, because he feels it promotes disunity among Republicans. I don't prefer the term because it operates on the assumption that Republicans are conservative, when they surely aren't.