toucanbuzz
No rule is inviolate
The KODT comic strip is a spoof on adversarial gaming. New gamers are trained by the "veterans" that the DM is always out to get you, and it's your job to know the rules inside and out to thwart them. When a natural consequence happens, it reinforces the players that indeed, the DM is a killer DM. Of course, as you see the rules lawyer gamer at the end, he understands "DM Code" for that's a bad idea.
The DM isn't perfect of course. The KODT DM was famous for grudge monsters (like the goring llama) and getting pissed when his players ruined yet another campaign (by taking out the BBEG at 1st level):
It's a spoof, but in the above example, the DM violated his own code of being a neutral arbiter of the rules and letting the dice fall where they may. It looks adversarial, but it doesn't mean the DM or the players are actually at odds.
If you have repetition of jerk actions and refusal to be frank with players (e.g. "A drow doesn't really fit the setting well"), then yeah, you've got something. Call it adversarial or what you'd like, but for me, it'd be a DM without gamers.