#3 Dislikes: Brock Lesnar
There's no doubt that Dean Ambrose not only doesn't like Brock Lesnar, but he hates him too.
The reason why Ambrose doesn't like Lesnar is because of what went down between him and Lesnar a few years ago.
At the WrestleMania 32, Dean Ambrose fought Lesnar in a street fight match. Since it was a big match, therefore, Ambrose wanted to give the fans an epic match, for which he pitched several ideas backstage.
But at the end of the day, Lesnar abruptly rejected all of Dean's ideas because the only thing he wanted to do in the ring was to destroy Ambrose and the same did happen.
The same was revealed by Ambrose on the podcast led by Stone Cold "Steve" Austin.
That said, it's enough to understand as to why Ambrose doesn't like Lesnar and I think in future if Ambrose ever gets an opportunity to work with Lesnar again then he won't think twice before rejecting it.