My goodness we have all got our panties in a twist this afternoon. Might I suggest that no-one here needs to prove their piloting experience, and should generally only be called upon to do so if offering technical opinions. No-one asks the pax here to scan and email their ticket stubs to prove their experience.
What people don't like is specific "what made flight no. XXX go round last night?" questions. Firstly, the likelihood is that no-one knows why, and secondly, the reason is probably pretty boring. If people have specific questions on flights, there are no fewer than three forums here for pax with questions, and it's quite understandable that people end up frustrated with people mis-posting, particularly if it's the same thing all the time (i.e. go-arounds and say, jump-seat visits). If this were a post about go-round procedure or something a bit less flight-number specific, people might not get so shirty.