LF
1. Why would you or anyone have told him anything?
Are you usually receptive to mussar from complete strangers.
2. I am not chassidish, but I do not see why it is relevant to your story what sect of judaism this guy was from?
3. Why is it relevant to your story to mention your personal holy behavior while on the plane, averting your eyes, reading a tehilim?
Someone might get the impression that there might have been some self righteous feelings going on here