We have a system of law and justice that is designed to prevent people actually visiting harm on eachother. We should draw the (very clear and very sharp) line at doing harmful things, and allow people to say whatever they want.
The alternative we're seeing is an ever-expanding, ever-blurring definition of what is policed as "offensive", stifling innovation and fostering division.
I cannot remember the last time I got offended by an insult. A little bit of stoicism goes a long way. It is up to you whether or not you get offended by an insult. I typically choose self-deprecating humor as a response to insults instead of wasting my energy getting angry.
And it's almost always advocated by people who have the upper hand in their own exchanges. Which is fascinating, isn't it?