First, we should probably clearly define the difference between "ganking"/attacking/"harassing" someone because it's the sake of the game, and doing the same with the intention of just displeasing someone.
No matter what the game is, those two are always distinctly different; when I play fighting games, there are people who may play in a "cheap" fashion because that's just part of their strat, and there are people who play in a cheap fashion just to caue as much irritation as possible. Those are really the only key differences. And it is a rather big difference; with the former, there's at least justification for it as it might be the only option left to the person to fill in a gap in his play, and the respect between two gamers is still upheld for the sake of what online gaming is about, which is to have a good time with other people. It doesn't matter what the game is, it is positive for both people, assuming they are both play games in a healthy state, and not getting unnecessarily irritated with the game.
With the latter, however, that person's sole intention is to infuriate you. No matter what the situation, this is a bad thing. It is disrespectful as it ruins the key point to even playing a game in the first place, and it's really not acceptable behavior ANYWHERE. Who the heck would want to go out of their way simply to cause other people grief? It's NOT what any game is about at all; there is not a single (successful) game in which the goal is to make the other person not enjoy the game and NOTHING ELSE.
Secondly, in light of what I had just written, instead of asking "Is it bad to do this to girl gamers?", I would in turn like to ask "Why does it matter if they're girls?" As I've explained, it's an unpleasant thing to do to both guys and girls. There is literally no reason it should annoy girls more than guys.
In short, it all relies on the intention behind the act. Doing it for the sake of enjoying the game is fine any way you look at it, but doing it for the purpose of upsetting someone is low, with no exceptions.
Also, some folks here should, and a couple of ussers (hopefully most) already do realize that some "gamers" (Not just girls), will intentionally provoke people to comment on them, then act irritated simply to garner attention and get people to defend them. The most generic example of this is the girls who flaunt their bodies and then get irritated if people point out that they are doing so, with claims that they're only interested in gaming. And, just as expected, even in this thread some people are already trying to justify it without even knowing who the person is.Of course, that's not the only sort of person you'll find doing that sort of thing.
And if you are (Or at least peg yourself as) clever enough to spot people doing this sort of stuff for attention, I hope you can are clever enough to remember NOT to assume that all people, guys and girls alike, are doing it for attention. For example, a girl may just be very attractive and simply come off as "provocative", even if that isn't their intention. Because if you just assume that, and label all of them as doing it for attention, you might just become one of those people who do nothing but annoy people, as I mentioned earlier.
