Best I can tell the school is just protecting itself from lawsuits - it is a publicly funded school as are quite a few colleges in Tx...and both state and Federal law would allow someone with enough money to sue if the felt "offended"...Not agreeing or disagreeing - just the underlying facts
The displays in stores, malls etc is definitely within the law as they are privately owned entities and can therefore do whatever the heck they want
And I can tell you from experience it is not lefties or libs that are doing this - it's people that like to run tort lawsuits for a living - similar to all the advertising out there these days for lawsuits against drug companies - a very rampant problem but not a political one by any means