Ask yourself: Why would that be? Can you think of a good reason? Answer carefully: There will be a test later.
Hey, why not go for the Gold and just declare the American Flag 'racist'? We once allowed slavery, you know... Or you should know, since we're getting reminded of it every day, although it's been over for a century and a half now.
No matter -- ban it! Ban it NOW! Let's cut to the chase. And if the picture below pisses you off, it should.