Odd. innit. There is Rightspeak, and Wrongspeak, and some folks symbols are sacred (like "Black Lives Matter" murals) but others are deemed "Bad". Some things are acceptable, but others are not.
Just because a (currently) special class of people are offended, then a symbol (like the Confederate flag) is verboten.
Of course, once the election is over, and the Dems no longer have a need for an agitated African American population (until the next election cycle) than the huhu will die down and things will go back to normal-ish...