Well, since it seems it was done in error, I suppose the issue is at an end. I would have said PTB though.
I will still say that preemptive bans are a valid tool. They have to be applied surgically to prevent problems, but there absolutely are multiple reasons to ban someone from a community they haven't yet interacted with.
I'm not sure this one meets the standard though. Even if you had made the comment, or a similar one, seriously, I'm not sure I can see how that would make you likely to go trolling on a vegan community.
Shit, I have actively taken the piss out of the asshole segment of the vegan population, and I don't go to vegan communities and pull that bull. So I can't see why a single comment would be enough of an indicator of future risk. And that's when preemptive bans are a valid tool, when someone is saying or doing something that shows they'll have a high probability of going to a community and cause problems. Not just because they hold a different opinion (no matter how wrong that opinion may or may not be).
Which, despite it being resolved, that is why I would have said PTB to begin with.
However, I'll also say that Sunshine is really easy to get along with normally. Everyone has bad days and makes bad decisions sometimes, and I think that's the case here. An otherwise very sweet person fucking up in a way that's not the norm.