There was no silence mate.
We sang "Everton" while ManU did their stuff with Charlton. The flags were lightweight plastic and were just thrown at random as a "wtf are these" kind of thing, which probably wasn't a great thing to do but noone was throwing them at disabled fans, though some probably ended up in that area.
Incidentally, putting the flags in the away end wasn't that bright. Noone wanted one as a souvenir, why would we, so they were all over the place including the steps on the way out.