In a word, "no".
Can someone saved a seat for me at the Christmas tree lighting? I should be down at TV some time next spring. Just Kidding!
This type of behavior reminds me of a small child who has no concept of anything going around them. I sometimes lament on the lack of courtesy and co-operation in the world that seems to be getting less and less as I get older.
If one sits so close to the stage, are they in the performance?
Come on, folks. Lets have some consideration for others.