Nah say excuse me while you pick their shit up and hand it to them or drop it on the floor.  I think I'm getting old because I've been defending myself and my annoyance of space wasters more often. I hate people who put their bags on seats and walk slowly 3 or 4 abreast. Fat people who walk on the left side in crowded places. People who stand on both sides of the escalator so you can't walk past as is intended. I guess I deal with a lot of tourists and they're mostly very entitled assholes.