What can you do? Somewhere along the line it happened that one may refer to 'niggers','faggots' and gloat about 'raping' people without fear of reprisals as its ok because it's just 'gaming culture'. I accept the point that the term at hand is meant to be 'domination' but it is still amounts to the normalisation and trivialisation of sexual violence. There's nothing to be done except for requesting casters and gamers to be less offensive and to consider men and women who feel visceral hatred towards the term. Unlikely to happen on the Internet though.
Ultimately it won't be human decency that will change this norm but expediency. With the eventual acceptance and inevitable mass commodification of e-sports - the community spanning Voobly, Steam and Twitch (an Amazon acquisition incidentally) etc will all start to uphold certain standards simply because mainstream sponsors won't want the reputational risk attached to the racist, homophobic and misogynistic 'LOLZ' inherent to the Games Community.
I think you're being a bit too precious there princess. Words should be judged on the intent. I can insult someone calling them 'mate' by the tone of my voice, as in being condescending toward them. I call my friends 'c*nt' in a friendly and jovial context regularly. It is entirely the context of how the word is applied as to how it should be judged. It isn't trivializing rape. Calling a lame tactic gay isn't mocking someone's homosexuality. Calling someone a d*ck isn't insulting the male genitalia.
**** off with political correctness.
There's nothing wrong with asking others to choose their words more carefully. It is a legitimate concern of some people and not a joke. :S There wouldn't be any negative impact to the community if casters simply decided to use a different term, i.e. destroyed