I don't understand why they hate the Glazers so much. OK, the Glazers are taking money out of the club, but so would any investor. The Rags were not bought at a bargain price (unlike City) so there's less chance of making money on the capital side - having said that, the Glazers' ownership has increased the capital value of the Rags quite significantly.
The Glazers have made significant funds available for transfers and wages. It's not their fault - at least not directly - if their employees have made bad value purchases and agreed to silly contracts like the stupid money given to de Gea, a declining asset at best. With better judgement/management they would be in a better place. Unfortunately, their fans seem to demand big names and big money signings, even when better value could be achieved. Often they seem to have made a signing just to prove they can outbid City, without considering value for money at all.
The only 'better' owner than the Glazers would be one with stupid amounts of money who did not want an immediate cash return. That means someone very like HH Sheikh Mansour, and they would hate that. Wouldn't they? Billionaires with the morals of Gandhi and no interest in getting money back are few and far between.