I see that there are many white people that is referring to, and for good reason. Even with good intentions, some can be insufferable arselings.
I also see an increasing acceptance of racism that holds all white people guilty. Such as a sign singling out "white people in particular." As has been pointed out in this thread, white people aren't the only ones capable of misbehaving, and not the only with members who are crap when it comes to race.
People shouldn't have to tolerate constantly being called and singled out and assumed guilty from the start, either and any and all ways it goes. That's a tool also used by guilt ridden Catholics and Evangelicals.