It's actually simple. These articles are satire. They're poorly written satire but it's satire.
When writers poke fun at society, they will typically choose to attack something that's high status. In example: it's more compelling to disassemble the flaws of a corporate executive, who is someone with power and wealth, than to do the same to a homeless person with hardly anything at all.
In this case, white people have a disproportionate influence over minorities in the areas of finance, media, executive positions, etc... White people by in large are generally a very fortunate lot of folks.
So when it comes to satirizing race, white people are going to be the number one target. If you make fun of a race with less success in society then a general audience will see it as tactless.
Race is a sticky topic either way. I think the modern satire of race has gone a bit overboard. It's verging on hacky at this point. There's still truth in some writers words, but it's tiring locating the good columnists in the sea of bad ones. Advice: avoid buzzfeed at all costs.
There's too many people talking about the same stuff online. Back when Pryor or Chris Rock or Dave Chapelle would spend years developing finely tuned truths about these issues, society would listen and grow. Nowadays, we hear the same things over and over. We exist in an online sphere that is oversaturated and redundant, and these issues tend to come across as belly aching and unoriginal thinking.
But it's important to remember that there is some truth to these thoughts. We white people are very fortunate, and it takes nothing away from us to recognize that.