Sorry you got slammed. That may be a design issue more than a rudeness issue. Often it is difficult to get the tray stowed, especially if the seat is reclined.
A Bad Day At Sea [with power] Always Beats A Good Day At Work
Carnival: Glory 2004, Destiny 2008, Splendor 2009, Freedom 2011, Valor 2012, Dream 2013
Celebrity: Summit 2011
Princess: Ruby 2010, 2014, Caribbean 2013, Coral 2014