Saying "White people" is not racist, but like GSDX said, it is based on intent and usually when directed as a message towards white people like shown above, it is racially motivated. The above paper literally says "Beware white people, they are coming for you" as if anyone is actually taking anything away from white people in the first place, when all these other groups are actually trying to get is equal treatment.
Religion persecutes multiple groups of people, like LGBTQ people. Call us pedophiles, say we're going to hell, want us dead, so and so forth. How do they respond when these people fight back? They act like they're are the ones that are being persecuted and told how to live.
When you are a part of a group of people that is constantly oppressed by either racism, sexism, homophobia, xenophobia and have a society that constantly tries to do deny oppression happens on the basis of these, how do you expect these groups to respond when no one listens? There are going to be plenty that act irrationally, there are going to be plenty of people who are going to act violently and there are people who are going to be racist in return.
Literally this year BLM started and of course, as with any group that exists, the bad apples started popping up. There were many parts of the group that were just looking to start trouble. What were one of the biggest criticisms? That they should protest more peacefully. Okay perfectly reasonable request, so a football player sits down during the National Anthem as a protest, what happens? These very same people freak out over it and resort to calling this guy many things, including racial slurs and therefore proving the point that no matter in what way people protest they will criticize you for it. Because they don't want to hear it, acknowledge it or care about it because it does not effect them.
What did people do in return to this football player as well? Make t-shirts with shooting target marks over his face. Yet if anyone from the BLM group did the same thing people would be all over it. The irony of this anthem thing as well is that the same people who freaked over it are the very same people who criticize this generation for being too "politically correct and sensitive." As if someone should subdue themselves to some ridiculous loyalty to a national song even if they disagree with how their Country feels about them and these things happening.
So, once again when you have people who are constantly oppressed and are trying to get people to listen, trying to get people to discuss and understand constantly have people denying, using rhetoric, playing these things down and silencing them. Then when these groups do act irrationally or racist, people then use these parts against them and make this the focus instead of the initial message of equal treatment. And this is completely infuriating, I see it happen all the time. 
Sorry for this rant, but I kind of needed to get this off my chest.