Sorry, even other parents disagree with you, and agree that this is disgusting, vile, nasty behaviour to change a diaper in a seat.

http://www.flyertalk.com/forum/trave...-ua-757-a.html

http://www.flyertalk.com/forum/trave...oom-floor.html

http://www.flyertalk.com/forum/trave...er-change.html

I'm glad that OP speaks up, and I thank every LH crew member who does the same (and they are not shy about sharing their opinion with the parent, which mirrors mine)