Penn was quite impressive and very smart on TCA. He is the one I always think about when I say Trump holds a grudge because Trump brought back Jillette and even brought him into the the finals. So there are exceptions to the grudge rule of thought.
So in that sense, you can excoriate Trump and he may let you back in if it helps the ratings!
Here is more on the dust up between Trump and Penn
http://lasvegassun.com/blogs/kats-report/2015/jul/16/donald-trumps-twitter-onslaught-penn-jillette-says/