It isn't normal for anyone else, of course. As for Garry, he is heavily invested in SF politics.
> no big deal
It is a big deal only if Garry was consistently inflammatory. Otherwise, it can be safely relegated to careless jibe by a drunkard.
> words are meaningful and have consequences
True, but one is allowed to retract, excuse, apologize. One incident unto drastic consequences will result in heavy-handedness wielded often, a weaponization against anyone standing upto establishment or established norms (which is quite contrary to what either the left or the right would want, in the context of political discourse).
> adolescents, but adults
Are we being too sensitive, vindictive, projecting remorse? One look at tech Twitter (and deleted tweets) and we'd want to cancel them all. What good is that going to bring, other than create an inescapable and ever shrinking echo chamber?
> some modicum of respect, or at least decency
Politics gets dirty from time to time.
> Wishing a slow death on someone, even rhetorically
There is probably a socio-political climate in which such statements could be considered incitement, but in this case, lunatics using Garry's words to threaten and scare their victims is exactly that... a work of an opportunist lunatic who probably thinks highly of themself. That isn't on Garry.