http://www.telegraph.co.uk/news/2017/05/27/trump-called-act-...
(I can just imagine if someone was walking round campus with noise cancelling headphones and got assaulted, I'm sure you'd be the first to blame them for not being aware of their surroundings)
Go ahead and tell that to the growing number of people with depression or other mental anxieties that they're being "hyper-sensitive pricks", I'll wait. I'm sure they will appreciate your advice. This is just as stupid as telling a depressed person to "just think happy thoughts". You're out of touch.
"bullying" takes on many forms, and while I tend to think that just words alone may not necessarily cause harm, I've seen it escalate to physical violence enough that it makes me want to nip it in the bud earlier rather than later.