I checked the logs, and no, it was for the garden-variety nastiness of the predecessor comment ("Have you been anywhere near technology for the past 20 years?"), and even that was probably just a last straw since I'm pretty sure you'd done it lots before.
https://news.ycombinator.com/posts?id=beedogs&next=6183189
Nowadays we tell people when we're banning them for comments like that; for a bunch of reasons it wasn't feasible to do that at the time. Even now, though, when we give a public explanation, some people love to fabricate a self-flattering story and post it melodramatically in later threads. They're careful never to supply the original data so readers could make up their own minds; hence the linkless martyr.
I guarantee you we would not have banned someone merely for supporting Snowden in summer 2013. It would have meant banning most of the site.