I really don't get the hatred for Pep. Yes, I'd like top see how he goes at a side without either total domination in a league or one without a bottomless bucket of money (or both), but to think that makes him a poor manager or something like that, is just weird to me. I think the days of a somewhat successful manager coming down from Scotland and changing all the rules are long gone...
Hatred is the wrong word I would suggest, it is more about trying to put what he has done/achieved into some form or degree of context, especially when trying to compare him to other successful managers.
Achieving success at clubs that don't tend to, or don't have a history of success, is I would say, far better than doing so either with ones that do, or doing so on cheat mode, with unlimited finance.
It is the latter, to which Pep has tended to stick with as a manager, so he really isn't up there with the very best, in that context.
What Clough did with Forest for example, usurps all of what Pep has done as a manager.
Just as Sir Alex broke the Rangers/Celtic duopoly, in Scotland was better than what Pep has done, Rafa with Valencia breaking the Barcelona/Real Madrid duopoly there in Spain, is better than what Pep has done (then add on what he achieved at Liverpool as well).
So, it is all about trying to put things into perspective that is all.