I don't understand this critique. Just because there is a large community of people on the Internet who say horrible and stupid things doesn't mean that those things are excusable. The better argument is to say that having poor taste and being socially inept are not criminal offenses, except in extreme circumstances (shouting "fire" in a theater)
Honestly, I think this is going to fall into one of those "it depends on your audience" statements.
If a popular greeting between people of the same culture was "F* you!" except the long form of that, or even something more grotesque (to you), is it wrong to, if you're a part of that community, say those things to one-another?
The internet, if anything, has created a large collection of very callous 20-somethings that can, off the cuff, say some really, really awful things, to a person that's not a part of their community. Huge parts of Reddit and 4chan are evidence of this sort of change in callousness.
Now, this particular instance of what he said, given what's happened in schools lately, was in terrible taste; and, if this is a pattern for him, he may need some real counseling, but the criminality of his statements is very suspect.
Long story short: what people are saying in normal conversation between each other is changing to things that older people, in part even like myself, find repulsive; but, it's normal and not-rude in their vernacular and it's a strong judgement call to call them socially inept and having poor taste - just different ones, and maybe "socially inept", if only in your social circles; but, when those statements cross the line to real threats or extreme circumstances, then yes, things must be done, sometimes through the judicial system.
