I know what he meant, and what his example of a norm was supposed to provoke in me.

You do? Roughly it was supposed to provoke a short term frustration but a net reduction in sensitivity to the real or (more commonly) imagined effects you may have on the internal state of other agents. Also a somewhat reduced impulse to publicly distance yourself from your own (minor) actions and instinctively withdraw.

From now on I'll just concern myself with the local group here, or not, depending on what happens over the next few weeks. In any case, I can let this account lie fallow or delete it. Which would disrupt the chain of comments less?

For what it is worth people would prefer you to continue engaging with the community here. If you don't think you would personally benefit from participating here then by all means move along. But for crying out loud, you don't need to second guess what other people want you to do. Too much tiptoeing about like you're walking on eggshells is perhaps one of the worst things excessive exposure to religion results in.