What consequences should Gary face?
So, in the end, it can be everything from nothing to a criminal charge and conviction with loosing his job somewhere in the middle.
Even if you take "die slow motherfucker" literally, it's not a threat. A wish that someone dies is not a threat. "I will kill you" is a threat.
People talk shit all the time, a lot of people in this post need to calm down and stop being so quick to be offended.
Should have said it? Probably not. Does that make him a danger to anyone? Not by itself it doesn't.
Saying "die motherfucker" makes it less obvious. Since the other extreme of "this person should die" is crude, but not a threat (lest Twitter would be shut down overnight). So it'd come down to the judge and how they interpret the phrase to get any headway
>People talk shit all the time
And that isn't right as a concept. "Shit talking" is almost never necessary in modern discourse. But the US has strong libel laws so "talking shit" won't lead to much legal consequence.