It seems to me the real issue is the size of the seat and selfishness of those who bring in seats which grossly oversized. there are seats that are no wider than the bench itself and have a back which is perpendicular to the back edge of their seat. these are probably acceptable.

People just do not seem to realize they are members of a group and need to respect those around them. As an example at Smackdown this year I witnessed a couple come into the reserved seats put their oversized chair seats down and basically take all the leg room behind them. to their credit they did move when it was pointed out they did not have a reserved seat ticket!