You can relax. The "rules" are mostly just common sense. I don't think you're in danger of being overly antagonistic or trolling or anything, so nothing to worry about.
The only weird guideline I can think of (which seems to differ greatly from other places) is that we encourage posting in old threads, even necro'ing threads from 10 years ago. So if you think there's a thread on a thing, do a quick search, and reply to that. If you start a new thread and one already exists, no big deal. We might link to the old thread or combine threads.
To your point, though — in general I think we aspire to be welcoming to folks such as yourself. If we're not, and if we do seem too insular, I kind of view that as a failure on our part. But hopefully that's not the case.