Clearly, people get offended at all sorts of things for all sorts of reasons all the time. Students aren't a special exception and this is hardly a new phenomenon (even if the Internet makes it more observable). If you don't believe me go read the 1 star reviews on Yelp and co. or the comments on your local newspaper's website. Or read your own comment.
The only difference between the inanity of every-day outrage/argument and students at universities complaining about something like cultural appropriate is that it's young liberals at universities complaining. People love complaining about each of those things individually, so their confluence is click-bait heaven.
To flip the table: what makes people who complain about young liberals at universities being too sensitive so sensitive? It's incredible.
It's not so much that I disagree with the concrete free-speech-promoting policies associated with your position on this issue. But complaining about over-sensitivity is just so silly; it's as if the irony of complaining about complaining is completely lost on everyone who talks about this topic.