I think it's fun, and, to an extent, good practice. When you're trying to learn a language, any time you're thinking or speaking in that language, you're actively learning or recalling what you've learned. I know a lot of people find swear words offensive, but I love swearing in German (main language I am learning)- I find it to be the most beautiful language, yet the swear words are jut as filthy, and I love that. There's no impression that what I'm saying is less in German than it is in English. Maybe it sounds prettier (to me it does), but it's just a bad, and I like that about it.