Funny thing is, I wrote an article on this on my website. Profanity is man made. Society has declared certain words to be taboo. These words have nothing to do with God. God did say there are things we are not to say...like taking the Lord's Word in vain...that is not pertaining to the worst one of all..."God...". That is referring to someone saying I swear to God when it is a lie.
God also told us not to call anyone a fool or tell them to go to hell.
A lot of times we just accept things because society says so, when we need to keep in mind what is important to God.