No camping on death match servers?

So I recently tried playing a few death match servers. If you're not familiar, basically everyone spawns in fully geared in a fairly small area. You just kill each other and quickly respawn.

I tend to choose random loadout.

Now, when I spawn as a sniper, I do what I would think is the intuitive thing to do. Get into an upper room of a building and snipe.

Apparently this absolutely enraged a lot of people.

I wasn't even getting tons of kills, but after 4 or 5, I would get several people coming up trying to kill me. Telling me I must be a total loser to have to camp a deathmatch server.

It happened enough times that I actually started to wonder if I really was the one at fault. Though I genuinely don't see the problem. The objective is to get kills. If I'm given a sniper rifle, I'm not standing out in the field with 20 guys with assault rifles. I'm sniping.

I don't know. What do you think?