Eh, the way I see it, in order for a any types of cussing to be considered a sin, you would have to intentionally want to say it. Most times when we cuss we say it in the heat of the moment without thinking. Many people use it as part of their normal speech without thinking about it. Also, many words that we deem as bad words really don’t have that bad meanings and have less vulgar alternatives that people don’t find offensive. Some cuss words practically have no meaning when they’re said. It’s just that we’ve deemed that specific word to be vulgar/bad. In the old days the bad words may have been more religious in nature and hence much worse.
If the cussing is directed at someone then there is more wrong there than the cussing (anger, hatred, abuse, etc). If it’s directed at God, then obviously that’s taking His name in vein and having those same emotions toward God. To me it’s the intention of using the word. Just reading the N word in itself is not bad. It’s bad when you talk about a person that it describes in a negative way. In that sense, it’s not the word that’s bad, but your intent in using it.