I don't know the fans turned on Hogan in 1991 and they were still trying to have him as a face. I think Hogan was what the people wanted. When they didn't want him anymore when he got stale they turned on him.
The fans started turning on Hogan from here vocally as WWE sweetened the audio when the fans were cheering for Sid when he threw Hogan out of the Rumble and Hogan did that heel move to pull Sid out the Rumble. The fans were also starting to side with UT and Warrior over Hogan too.
Hulk Hogan also wasn't as corny as people remember as Cena and Roman were. Hogan use to do heel tactics and had more of an edge in his prime. Jesse Ventura use to call it out all the time in his matches. Watch Hogan's matches from 84-88. It wasn't until 1989 with No Holds Barred Hogan was trying to keep this squeaky clean more cartoon character because he was thinking of Hollywood more. He was also not trying as hard in 1990 plus because it seemed that Vince was trying to have Warrior replace him.
The fans still preferred Hogan overall though which is why he got back the belt in 1991(horrible Slaughter feud) and was brought back early in 1990. The Rock even mentioned how the fans turned on him because he got stale when Hogan came back in 2002 when they did that face to face.
Hulk Hogan reinvented himself in the Monday Night War era and almost helped put Vince out of business. Hogan just had charisma unlike most of the wrestlers which is why people watched him.