That's something I'm fond of saying and you're right. But various private orgs to set rules or contractural obligations. The closest thing I can think of is the FCC and its obsession with profanities, nudity, and sex. Even then I think those regulations, if they are actually written into law, are strictly regulating only commercial speech which is not subject to the free speech principle which is the flip side of no one having the right to be offended.

Just remember the more someone calls attention to the thing that is offended the more they amplify that thing. If Berkeley students just boycotted speakers they don't like those meetings would pass by poorly attended with barely a whisper. Instead they should invite their own speakers, and vigorously debate them. Remember that the ACLU defended the right of neo-Nazis to march through Skokie where many Holocaust survivors lived. And yet we survived. And Germany who has very strict anti-free speech rules that would outlaw such things still have plenty of neo-Nazis.