#1 Kurt Angle
Kurt Angle is another Superstar who has never worked with CM Punk, but he has had real-life heat with him that stems from the comments Punk once made.
During the Wizard World Comic Con in 2012, CM Punk was asked (skip to 38:27 mark) which Superstar from the independent circuit he would like to face in the future. Punk said that he would want to face Samoa Joe, but a fan reminded him that Joe works for TNA, and Punk said that he was already aware of that.
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At that time, Angle was working for TNA, which is why he didn't take these comments about TNA being an "independent" company lightly, and attacked Punk on Twitter. Angle said that when Punk was trying to make a living, he was at the pinnacle in WWE, and that going to TNA was his own choice.
In another tweet, Angle also warned CM Punk to watch his back the next time he comes across him as things could get ugly. While Angle later apologized for his comments to both WWE and TNA fans, he said that he still held a grudge against Punk since he disrespected TNA. Angle also said that Punk needs to learn a lot about fame and the responsibility that comes with it.