I have a hard time believing that the video games cause much of anything socially undesirable (other than the obvious binging behaviors). It is mostly the playground for the escapist and nihilistic fantasies of the consumer.
However, I think that while video games do not cause sexist behavior, a substantial portion of video gamers, both of the casual variety and the hobbyist, are in fact very sexist. In particular, video game and geek culture seems to be obsessed with this idea that because they were overlooked by many girls over the past few decades, it's a "boys only" club and it should stay that way. They aren't always consistent in that wish, however. Many times there is this yearning for a "good woman" to either play the games with them or support it like an indifferent significant other allowing the bank and time to be used in the pursuit of toys. Yet, this narrative is almost exclusively fixated on what the woman could do for the male gamer and geek, rather than building a healthy two-way relationship where they learn and embrace the culture of their partner. It's a very solipsistic fixation.
In this boys only club, you will see some of the most backward, childish, and vicious attitude toward any group that may displease them, including women. In many respects, instead of transcending some of the most vile attitudes that they identified as being unleashed toward them, they have merely adopted some of those attitudes and behaviors into their own technocratic and esoteric social circles.