It's fine, give it time and we will hate him less.
It was the same with Lippi back in 1999, only difference is he (finally) accepted responsibility and resigned. Allegri just won't because he's convinced he's doing a good job, his post match conferences are nothing but cringe. Allegri was once a great manager, now he's just a deluded and senile bold man who thinks his players can pull out a goal out of their ass and save his job.