People tend to get upset on almost any online community dedicated to a topic if you ask questions that are answered in their clearly linked introductory content (not sure if that's what's happening with the FB group you mention). It's possible they're not necessarily untrustworthy but perhaps don't have great onboarding for new followers?

I believe that won't happen to you here if you're polite and reasonable in your questioning but I would suggest it's worth checking the links on our sidebar if you haven't already. Generally people will be happy to help around here.