Why shouldn't it be the player's job? They're all part of the same group: it's not as if the DM is responsible for how the group interacts.
The OP might just as easily feel it to be his responsibility to take the DM to task for not dealing with the perceived issue.
My view is that if the OP is happy with how the DM is handling the situation, he should ignore it; if he feels that the use of loaded dice and the DM's approach are detracting from his own sense of enjoyment, then he should address the matter, possibly in front of the group as a whole.
How old is this player? Cheating at D&D is pretty... I dunno. Weird.
Because the GM *is* responsible for how players interact with the rules. The GM has recognized the issue, and put a solution in place to even out the rules issue. So, why is it then the player's job to unilaterally throw that solution out?
I agree. Dealing with these things is hard, but it does seem to me that a healthy, intelligent adult who understands the game would have to have something going on to do something so blatantly inappropriate.This isn't a gaming issue. It's a mental health issue.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.