For me the dislike of Allardyce is simple. For me it's not the person,, it comes down to hope and ambition.
A new manager brings hope that there maybe a perfect fit, a spark that brings success. With Allardyce, there is no hope, he has a track record over the years of getting by. No hope exists, just promise of a mediocre league finish.
It's bad enough starting a season in the sky era, knowing it's going to go down to the size of the cheque book, and the media will only ever cover and laud 6 clubs, when we've been the 7th. But the promise of a man who has only ever achieved mediocre, apart from in his own head, rather saps the soul of any reason to continually show an interest.