This is most likely be very unpopular, but how is this a race issue?

rude, yes. assault, yes

but because she is black, or because she was standing and dancing in the way of the people behind her?

more to this story. sounds to me like they asked her to sit or something and she got in their face, and they responded like idiots, but not because she is black. maybe because she is rude too.

The woman was wrong to throw anything but depending on the seating maybe that was not a good place to dance. If it has fixed seats there may not be a lot of room and you are basically rubbing your butt to somebody’s face.
Had they said something racist it would be different but obviously they didn’t since Solange would definitely had said that.

She might have been in a minority because she went to a band that not a lot of black people like, but this wasn’t a racist issue… that is what she brought to it with her interpretation of of the evnts. Did someone use a racial slur? Did anyone mention race or colour? I know we need to be sensitive to issues regarding race, but there are too many people with real race problems to address to give too much noise to this non-event. Those a-holes probably would have thrown a slice of lime at anyone blocking their view, regardless of skin colour.