When sending a message to someone just to be friendly do they even see it or are they just that rude

They might have it filtered based on gender or age or relationship and never see it.

Oh I am never rude to people that send friendly messages. I was raised better than that.

their world doesn't revolve around responding to your messages I suppose

My messages are filtered. I only check it to trash them. Maybe thats the case.

some people are just rude

It's not being rude to be careful... I don't usually answer messages unless I know them a little, have read their stories and questions, had them checked by the fbi, cia, homeland security ect...lol