Well, I started role-playing 10 years ago with table-top games. (Rifts, Shadowrun, D&D, WW)
A few years ago I got into a Vampire LARP and I played for 3 years. At one of the last games I played there I met my current wife who is pregnant with our first child.
The LARP was fun, when I was in the right mood for it. I had to ignore a lot of bull




, but it's the normal bull




that you get whenever you get a group of people together.
I've since gotten back into table-top gaming.
I can't say which I enjoy more. They're both fun social experiences. In either case you can get personalities that clash and strange rivalries. You also get a chance to meet good people and make good friends.
Most of the LARPers I played with also played table-top games and CCGs. I've noticed, however, that most of the people I've played D&D with (that I haven't LARPed with) were a lot less amiable toward Vampire LARPing than the LARPers were toward D&D (a few of the LARPers other than myself did both).
I'd say that it's more a matter of who you're playing with than what you're playing. Yes Vampire, naturally, attracts more gothic types that may be anti-D&D because they would be ashamed of role-playing if they weren't playing vampires. This is not the fault of the game, nor is it representative of the entire LARPing population, as already evidenced by previous posters.
If you want to LARP, just like D&D, be sure to play with people you like, or else it's just annoying.