I personally like people who are willing to show a certain level of crudeness, it shows they're willing to give their unfiltered thoughts and aren't living in fear of other's opinions or the expectations of society. It can really show confidence and openness.

Yes, I understand that swearing your head off or being a ridiculous motherfucker all the time is a sure-fire way to make yourself look like a dickhead - but I do it anyway.
If you water yourself down for the fear of someone else not liking what you have to say, then you probably don't believe too strongly in what you're saying and should stay quiet anyway.