I doubt Nanette would say this if the cast was white. Meet The Browns is an EXAGGERATED comedy. It doesn't reflect any real people nor does it try to convey how black people behave. It's not even playing stereotypes. Mr. Brown is very, very funny and the show is written not to be serious or to imitate any group of people. He is almost literally a clown.. a real clown. Clowns do over the top things to make people laugh and this is what this character does. The other characters are serious some times and some real social issues are explored some times. But the show is designed to make you LAUGH. If you think this make black people look stupid, then the Three Stooges make white people look stupid. That's ridiculous.
If you have never seen the show try to start in the beginning, season 1 and give it more than 1 or 2 episodes. It's a family comedy show and better than most of the filth on TV today.