You have to understand how fluid and changing these things are. Brock had a BAD year. The story from Ambrose about how lazy he is. The fact that he got outed as a cheating little bitch using performance enhancers against Mark Hunt. He was very very rapidly losing his allure to most people. Then Goldie showed up and KILLED him and we all fucking loved it, because it made Lesnar look a little humble which was a good choice for him perception wise, and Goldberg was awesome. It was great.
Then Goldberg had a match with Kevin Owens, inserting himself into the single hottest storyline on Raw at the time, and did even less work than he did in the squash against Lesnar. This was way different though. It was a beloved smark champ and not the hated Lesnar. As much as people didn't like seeing KO having a pretty lame reign for 90 percent of his run(Until he killed Jericho at the festival) Goldberg went from being this awesome returning nostalgia pop squashing people like we wanted to see, to the guy who squashed the wrong person in the wrong time in the wrong place.
Any fool on this forum could have told you that Goldberg would be turned on if he inserted himself into the title scene and just shit all over KO and took the title and then went off TV for a month until Mania. In what alternate reality would he be cheered for that? It was the ultimate fuck you to the fans, the ultimate scenario maybe ever of an older part timer coming in and just taking over at Mania season only to fuck off after a pretty small amount of actual ring work. So Lesnar went from the boo fuck you guy to the enemy of my enemy is my friend.
People didn't love Lesnar so much as they wanted to see him kill the part timer who was EVEN LAZIER than suplex city.