It may be about racisim but there is no way to know for sure. Not enough information.

It could be about economics. Are the people at the fence flaunting authority and sneaking into the game for free? Or are they unable to pay for a ticket and sit with the rest of the people.

Poor people of color in this instance - econimoc injustice certainly plays a part in their lives.

The bigger issue is our focus on the foreground instead of the whole image is a systematic mindset of the small minded - characteristic of the times we live in.