You used this "offended" angle yesterday, and I'll reply to it the same way I did then: it's not about me being personally "offended", it's about how one insult leads to another and the quality of discussions goes down the toilet.
But since you mentioned it, yes, some people do get offended by the mud-slinging, and they participate less or leave, and the site is worse off for it. The insults serve no functional purpose, and again, we already have a "free for all" forum where people who can't control their tempers can "express themselves".