I don't think he gets "hate."
He gets stick because he gives it the big licks and doesn't get the results to back it up. His insistence on a brand of football that rarely works - as shown by his paltry FOUR wins in three years - draws the ire of fans because he's so unwavering in his insistence upon it. I'm not saying it's right, but I think it's a British cultural thing to bring people down a few pegs if their self-confidence outmatches the evidence of their ability.
ANY manager would be getting the same treatment with that record at a normal football club, let alone the 6th most successful club in the country this century who are hovering above the relegation zone in League One.
Frankly I don't care who his wife is and I find people giving him shit because of who he's married to very weird.