Personally I find youtube comments hilarious for the most part. There is a bright side to creativity and, generally, through the voting system the best humored comments will tend to get the most votes, so standing out.
There’s also a plus to letting folks contribute freely if they want, because the reader is also free to disregard what he dislikes. (And should something get out-of-hand you can disable the comments or perhaps delete them.)
Sometimes I do get “offended” by some comments, but the right word is “repulsed” by vulgar language and profanity. You are not responsible for other’s actions for the most part, and I’ve learned to take a certain liberality with others sinning, because we all are, after all, sinners - it is their freedom.