Yes, Utd fans are full of Glazers. They think they would go back to "old" glory path without them. As they have a high chance of winning EL they are "delusional" that they are entitled to PL and UCL titles.
While there is City in the PL they will have a hard time. Unlimited moneyflow is touch to far for them.
United produces and spends just as much money as City does, they can definitely compete. Secondly, yes they can do better without them. Glazer's recruitment policy over the past 10 years has been shambolic. They haven't had a real right winger since the early 2010s, excluding Di Maria's 6 month tint. They simply do not know or understand how to manage a FOOTBALL club.
Also, they don't spend any of their own money on the club. United spends the money they generate. In fact, the Glazers take money OUT of the club (around 80m a year).
If anything United fans are justified in their anger. These guys are not only leeches, but have completely made them uncompetitive in Europe too. I don't know about going back to the glory days when theyre gone, but they sure as hell don't need them.