Anyone else appauled by christians who cuss?

I mean SOME christians. Not ALL. I was on Facebook the other day and looking at some of my youth group's and some of my christian friends statuses and convos. A lot of them ages like 14-20 wrote words like "a$$", "", "shyt", "dam", "beyatch", "f@g", "eff" and etc.. (Sorry if i offended anyone. Just some examples of what they say) They write stuff like that and i never really paid attention until i realized that christians shouldn't say those kinds of words. Not even as a joke. It really disgusts me when they write and say those words because they say the lord's my savior and my life.... But a while later, they're like "shyt, I had homework". "haha, you're such a f@g" and things like that.. I dont think they care much that its a sin. People really need to think before they open their mouths.