It very much depends on where you live. Many Republicans were livid about Michelle Obama’s healthy school lunch effort and that inspired unnecessary rancor over what shouldn’t be controversial.

The other problem is that if kids aren’t used to eating vegetables at home they might not eat them at school, and the schools don’t want to deal with increased waste / throwing.

It's so weird to me that free school lunches for children are something that is not 100% immediately obvious and uncontroversial and beyond any discussion.

Even in the UK in the 1980s, at the height of ghoulish neoliberal Thatcherism, there was a major controversy when she tried to stop giving free milk to kids in school (milk-snatcher they called her).