Do you swear in your code?
root: It is ok as long as only friends read it, "Haha, look, Johnny used a swear-word, he's such a witty guy" they'll say. But there may come a day that someone who doesn't know you reads that comment, without knowing you and your colorful personality and reading it completely out of context her first impression of you will be that you're a cantankerous old fart and she'll hook up with that dumb html-"programmer" instead.