Yes..but you fail to see that the reason your think we should talk a certain way (leaving out any bad words) is because you've been taught BY man, that these words are indeed "bad". You say we should talk a certain way being Christians--I agree--but I also say it was MAN who made any and all of those words awful in the first place. Yes, they are AWFUL now, I get this.....but there's a reason the Lord probably never gave a no-no list...that's because to Him, they were words...just words to mankind. Our heart speaks and yells filthier things, and that is what he judges. Thanks man, don't know how many more times I can debate this, or say the exact same thing in different words. I appreciate your concern-but we are just going to have to agree to disagree on this one.
God no doubt created language, words, speech, etc.
However, it has always been man who has made things unacceptable or sinful to God since the day Adam & Eve chose the wrong tree. Yes, there are things that are not always inheritently evil to every culture, but God knows the culture and that person's knowledge and heart. IF.... IF you use bad words that you KNOW are unacceptable to a culture knowing they are bad to that culture you are serving your own interests and not God's interests because God would want us to do the best possible good in every situation. We do have a liberty in Christ, but we are also bought and paid for with a price, too. We are not our own. We are servants of righteousness and not ministers of darkness.
Also, the devil can't do anything without God's approval. It is possible seeing that seeing that cussing certain words within various cultures are considered bad, it makes sense that filthy talk would be a part of the devil's kingdom and not God's kingdom; Therefore, it is logical to believe that the list of bad words used by this world are indeed unacceptable to God (According to the various different cultures).
I mean, have you ever walked into a room and heard people cussing and just made you sick to your stomach where you had to leave? If you have not had that type of experience, then I would say get away from the things of the world for a while and get more into the Word of God and prayer with the Lord (And you will then start to see the evil for what it is). This is not complicated issue. Saying certain bad words (ones invented by a man) is still wrong to say. It would be like a man creating a statue of some evil god or some naked couple being intimate with each other and then promoting that to people. It's no different. Words just like that work of art can be evil.