I kinda see where
@HELLAFLUSH240SX is coming from but at the same time don't. I don't generally know anyone who died, whether or not they are good and didn't deserve or evil and getting some kind of karma. It is always sad to see life go to waste but due to no actual personal connection with any of them nor did I ever care for any of them before their death so I can't really show "respect" to them.
HOWEVER, other people might have personal connections to them and want to show the respect they have to them. You are being a bit rude and selfish if you aren't letting them do it. They aren't forcing you to show respect, sorrow and grief so why should you interrupt them on what they WANT to do?
If there was a memorial or something like that for someone I didn't know or cared about before their death. I wouldn't go off and make interruptions and rude remarks and just sit quiet as the rest do what they want to do, to show respect.