Horrible watch, will not watch again, and actively advise against watching.
First off, this is not a movie, it's a anthology special of short skits that would have been rejected by SNL.
It's honestly some of the most offensive humor I've seen in a long time, and It's not that you can't be funny by being offensive, even from an obvious villain, but jokes usually require a punchline. Just being or showing racists things isn't a joke in itself, it's just celebrating racism. The punchline being "look at this awful thing that no one would do" loses its humor when someone actually does it.
Watching Michelle Rodriguez give high-brow woman's opinion of bad porn was, by far, the only thing I really wanted to see more of. Even the "bad porn" wasn't funny, just stupid and a waste of time, though I wouldn't mind seeing better "comedy porn".
The only other thing that was funny was the hot tub scene, and that was much more about people being uncomfortable with sex than race.
Lohan doing a Marilyn Monroe was a little funny, but it bookends the movie and didn't really payoff.
Just don't bother with this, watch anything else.