Me and my friend have smoked in a graveyard a few times before school or right afterwards. We always just stay in the car and drive around looking at the graves/smoking. Then we leave.

I can see how some people might find it disrespective because...hey, you don't know if the person you're smoking on top of liked pot. If they didn't...that's disrespective. If they did, that's cool. They probably want you to try and get them high anyway. "Yeah, hey, come on buddy, just try. Heaven's boring the SHIT outta me!"