Kaci Hitchox, the nurse who was (until an hour ago) under quarantine in Maine, has received death threats on social media. No link has been made to gamers. If you look up just about any article that allows comments, you'll see posters (many posting from facebook accounts, i.e. with their names and pictures) calling her a b*tch, a c*nt, a wh*re, and many other derogatory terms. I really don't see why this is about behavior among gamers than among behavior online (and offline).
Peruse the anti-Hitchox page on Facebook for a near limitless quantity of non-anonymous material: https://www.facebook.com/MainersagainstKaciHickox
The response calling gamers all sorts of actual or perceived insults (some of which sexist: why are they insulting men as "virgins" if not to imply that a lack of sexual "conquest" makes them losers? Gender stereotyping is ok if it can be used to insult the other side?) not only isn't productive, but also clearly misdiagnoses the problem. A quick look at the above comments against the nurse shows that the offenders are both men and women, many have pictures with children (hence likely not virgins), report being married, and who don't seem to live with their parents (which is also a classist insult: that's often a sign of poverty more so than lack of maturity).
How common such insults are outside of gaming matters a great deal if those (rightly) criticizing such behavior attempt to (incorrectly) link it to anything that is particular to the gaming community.
edit: As for who gets online death threats these days -- here's a current story of an 11 year old boy getting a bunch of them: http://www.mlive.com/outdoors/index.ssf/2014/10/michigan_hunters_rally_around.html
Note how this is not remotely connected to sexism, the target is not a woman, and the originators are those opposed to hunting (i.e. people concerned about the welfare of others, animals in this case). The article also mentions some specifics, with someone suggesting the boy should take his own life, and another suggesting he should be put into a death camp. Cheerful!