It's really not asinine and never will be.
You don't get penalized for casually tossing out an F bomb once in a while. You only get penalized if you're reported to a GM for harassment, and usually that only leads to action if you're jumping through hoops to harass them after they blacklist you (which is what GMs will tell you to do first).
People have a potty mouth in game all the time, that by itself doesn't rise to the level of punishment unless its habitual or you're actively harassing a particular person. Getting banned in game for anything other than illegal activity / RMT type stuff is not easy at all, unlike here on the forums where you can get banned for breathing the wrong way. Point is, they don't just casually ban people from the game, because that's not conducive to making money. If you actually get a punishment for poor behavior in chat, it is not going to be you just saying "____ you-" it's going to be a lot more than that.
Because of that, if you actually get banned for it, well, you probably deserve it.