If your read the comments section the poster is a she, not a he. And other comments posted by other individuals who apparently know this guy seems to indicate he is a nutter homeless guy, not a student. That is the issue, why is he there...able to just walk in and commandeer a classroom?
I posted the title to give it the context. Reading racist comments is irrelevant to the issue of what is occurring on the video, and constructs a strawman IMO.
I didn't read any of the comments, I only read the description of the video, and not that it matters, but she never specifies her gender in the description.
And the title doesn't give much context, only that someone is in charge at a public school, possibly the guy in the video who could be a teacher or student acting out a scene or teaching about freestyle rap. All we have to know that it's a homeless guy wandering into a classroom is the word of the poster on youtube (and apparently some added comments to the video), and she doesn't seem to be very unbiased when it comes to race and could easily be posting an out of context video just to incite some anger.
When it comes to internet videos, I generally don't believe they are true until someone provides some indepedent evidence that it is true, such as a newpaper article on the event. If you remember, I felt the same way about the office beatdown video (which ended up being fake), so it's not like I'm creating a special requirement for this video.