Definitely, for sure both jews and muslims. The "following instructions from female flight attendants" thing I would guess also isn't out of the blue... maybe the airline has had experience with people not following female flight attendant rules.
> The "following instructions from female flight attendants"
There have been a few instances of people refusing to allow a woman to sit next to them. They don't always move themselves, they sometimes insist the woman is moved.
It would have given them an excuse not to let him on the plane. Not that they needed the excuse, obviously, but they would have liked it better if they had a reason. "There's no room on this plane that wasn't designed for such a thing."