It's worth noting, though, that abuse can sometimes masquerade under the guise of well-intentioned critique. Ultimately, when it comes down to it, don't feel the need to change anything you don't particularly want to change about a story, regardless of what someone else thinks about it.
Also, giving my input to @NickRowler 's comment, @Savannah covered the basics: there are plenty of people who jump on the "trigger" bandwagon and count on the good nature of people to react sympathetically, which most people trying to be good people will do; it's led to a not inconsiderable amount of abuse by those who are, perhaps, less than scrupulous about wanting to feel special. It's also worth mentioning that "white" is not an ethnicity, it's an extremely inaccurate and outdated blanket term for a skin tone. It might be better, not to mention more enlightened, to discuss ethnicity rather than to jump into the problems of the inherently repressive sociocultural construct that is "race".
But that may be too deep a subject for these forums, and it's almost certainly getting beside the topic. To extrapolate slightly more on the subject, @Savannah 's comment about not being able to create to one's preferences has some validity to it: if you're creating for artistry and trying to challenge comfortably-held beliefs, if you're trying to push the limits as most artists believe is essential to artistic expression, if you're working to advance sociocultural standards and opinions, then it's going to be tremendously limiting when the environment is restrictive to you. Currently there's a tremendous and highly debatable atmosphere of easy, instant offense at things that are often only arguably yours to be offended about in the first place. Right now, especially if you're trying to make a statement or tell the story you want to tell, you have to be more mindful than ever, just in case you might accidentally offend someone -- for real or just for someone to pull the spotlight on themselves -- and there are real-world consequences for that, either way. It's a consideration that does, practically speaking, make it impossible to draw or write according to what we would like to do.
It is worth pointing out, though, that standards are considerably more liberal than even fifty years ago. It might shock some to realize that nudity -- which, I have pointed out before and will continue to point out, does not necessarily have anything to do with sex or anything "adult" -- was pretty much illegal in various media in the United States until the 60s!