I've noticed this problem a few times, once even from a duck What are we supposed to do about it? Just call people out verbally? Report them?
If you know the person, and you take issue with what they said, I would try talking to them (perhaps privately), and if it's clan related, talk to someone higher up that will be listened to, and ask them to have a word with that person, especially if they got defensive about you taking issue with their behaviour. You can also mute and/or report. You don't have to allow them to subject you to that kind of stuff.
A lot of the problem is to do with how casual that word is in the context of gaming, it's become such a strong part of the common lingo used when describing a game. I have even heard it used during streams by Icarus casters. Now, I'm sure it wasn't on purpose, and there wouldn't have been anything malicious behind it, but at this point in gaming culture the word is the equivalent to saying that one side really soundly defeated the other. That's bad. We need to separate words like this from their casually used nature. This also applies to other words that involve hate and bigotry. The gaming community uses them so casually and dismiss anyone offended by it as 'butthurt'.
I supposed this is as good a time as any to introduce this. But I recently became aware of this site.
http://gamersagainstbigotry.org/It has a kind of petition in it where you vow to be aware of the language you use and how the connotations behind them can really hurt people, regardless of YOUR intended use of the word. It also has a section in there about the casual use of the word 'rape'. Found here:
http://gamersagainstbigotry.org/2012/07/why-you-should-stop-saying-rape-casually-in-games/Now I'm not demanding that people actually sign it. but it might be a good thing to keep in mind when trying to be aware about the gravity of this kind of speech. We can make this a really good community.