The airlines could help themselves by offering the emergency exit seats to tall people at checkin or embarkment. It would avoid a lot of aggravation for the cabin crew. I'm too tall to sit straight in standard seats, and so have to sit with my legs sideways, jutting into the personal space of my neighbours (who justifiably complain), or out into the aisle where they interfere with cabin crew.
On one recent Easyjet flight, as I was embarking, the attendant took one look at me and said "you're a tall chap, we'll but you in the emergency seats row". That was great service and something I wish would be done more often.