Did you hear even a single syllable about them in the trailer? According to the trailer, they're just some random group of black pilots called the "Red Tails." It's even strongly hinted that its a work of fiction, as the only way you'd know otherwise is if you already knew.
And in regards to the people throwing their
noses up in the air about people condemning a movie after a trailer, how is that any different from the people jacking off to it after a trailer?