I don't live in the USA and I never had student loans. So, this isn't personal for me. I have to say, this seems like a ridiculous characterization to me.
People take out student loans to go to school, which improves their prospects of a higher paying job. I don't really care about people who went to school and paid off their debt and whether they think that future generations should also have to pay off their crippling debt. What I care about are the opinions of the people who could have gone to university but didn't because the debt required seemed outrageous.
Imagine co-valedictorians at a high school. One gets into university, takes on huge debt, gets a good white-collar job, and starts paying off that debt. The other sees how enormous the cost would be, and instead gets a blue collar job. I would imagine that if the white collar worker got their debts wiped out, while the blue collar worker got nothing, that blue collar worker would be pretty annoyed. I would also imagine that someone choosing to go into a blue collar job out of high school would be much more common among a certain group / class of people.