From the article:
“Play is an integral part of human evolution and learning,” she says, mentioning that this is a topic she covers in her book. “Gaming, being the most refined form of play in our time, has much to offer. Instead of focusing on what gaming is not, it’s more effective to showcase its true essence. The industry’s effort to create a more diverse range of games, beyond merely violent and intense ones, will help showcase the broad spectrum of gaming as an expression of creativity.”
I would imagine a whole myriad of different reasons, some rational and logical and some bigoted and dunse.
And not to mention, I have seen many many many comments upset about race focused casting (over talent, ability, suitability to the role etc) and then people ask 'why are you complaining about race of gender of a fictional character."
So… they think they commentor is being racist because they actually engage with the subject.