Yeah in regards to throwing trash I wasn't really happy to see that at all. It's just makes them all look like gigantic blowhards.
However I do remember back in the 90's the Angels did seat cushion day, and the ump blew a huge call during the game and almost EVERYONE threw their seat cushions on the field. Now THAT was funny, not only cause they were soft and really couldn't hurt anyone, but because even from the upper deck people were flinging them like frisbees and they'd still sail all the way down to the field.
Not much longer after that they started doing throwable giveaways AFTER the game lol.