Rereading this quote it makes sense now. Its going to apply to NBA logos and merchandise that NBA teams already licenses and control. So i doubt that any kind of color or other sayings on shirts will be banned.

The Wall, which will hold up to 4,500 fans in total, has a strict set of rules, too. Those seated there won't be permitted to cheer for or wear the gear of opposing teams.

"This section is for Clippers fans only," the team's website says. "If you choose to be a part of The Wall, you (and your guests) can't cheer for the opposing team or wear any gear that supports our opponents."
lol i highly doubt it. Favorite NBA team isn't a protected class lol

the mentality of society is just mind blowing to me
No, but it is very easily to accidently infringe on the rights of a protected class.