I don't get why student loans are seen as worse either.
I would be a lot more worried about a potential mate with 20k in automobile, or especially CC debt, than student loan debt. The student loan was taken with the idea that the degree would increase income, hopefully by more than the payments on the loans. When done correctly(engineering, business, medical, etc. degrees) taking on that debt can significantly increase future income, making the debt worth it(especially once paid off).
If their income is over 130k in their mid 20s it sounds like the student loans achieved their intended purpose.