Its not anti-banker populism. Its the bailout mentality that these bankers have that's disconcerting. A startup that fails disappears the way its supposed to, but when a big bank fails we all pitch in the bail them out. That's the problem.
Whenever you generalise something to a large number of people, you commit some sort of anti-? ?ism. "Bankers" are not a singular entity that can have a "mentality".