Apparently Jay-Z was not pleased when Amy Winehouse made fun of Kayne at the Glastonbury festival last week. “Amy then went on a rant about Jay-Z, telling the crowd to be thankful they weren’t getting Kanye West because he is a c**t.” Jay-Z did not find the remarks flattering and was pissed at Winehouse. He said, “There’s no need for that. I don’t know what went down, But Kanye’s cool.” Jay-Z took his revenge by mocking the singer’s hit song, Rehab while at the O2 Wireless festival. I was able to dig up a video of the performance and it’s actually pretty good. Check it out below…