FYI, I don't know if Paul Ryan has kids, but the fact is that these days most kids don't go to school with a brown paper bag - most kids buy the school lunch with a prepaid card, even if they have working parents. (In fact, it was that way already when I was in grade school in the 80s.)
Many parents don't have time to make bagged lunches anymore, and many kids don't want them anyway.
Such utter bullshit anyway . . . I can't imagine any kid saying he would rather not eat than eat a school lunch merely because it was paid for by you and me. I bet he's never really known any actual poor, hungry kids. I bet his buddy Scott Walker (and staff) haven't ever, either.