He rattles people in areas that they are very hung up about or in areas where they are simply unconscious of their own stupidity/prejudice/fears/bigotry/pretensions/etc. I think there is some value in that sort of satire. People's dirty laundry gets exposed by him, and that's why they don't like him, but anyone who is capable of laughing heartily at their own foibles and weaknesses shouldn't have much trouble with Sacha Baron Cohen, in my opinion. All you have to do with a guy like that is not lose your temper.