It is common sense that anybody that takes custody of a child is responsible for that child’s well-being. No reasonable parent would give their child to a teacher that recklessly starved, suffocated, or dehydrated students. Nor should they send their children to a teacher that routinely alienated, controlled, and frustrated the skills of their students. All human have primary psychological needs for relatedness, autonomy, and competence which are just as important to well-being as the other more well-known needs. I take nurturing to mean, at minimum, the support of primary human needs. It is common sense that anyone who takes custody of a child has a duty to ensure that their psychological needs are supported. Independent of anything else they may be obligated or committed to accomplishing with that child this is the minimum of care that Is owed to the child.
This common sense view was put into common law through a principle called in loco parentis. The following series of quotes, mostly from legal decisions, will help illuminate the principle.
In Sir William Blackstone's compilation of English law from 1770 he made it clear that the “exercise of power [by a tutor or school master] is limited to what is ‘necessary to answer the purposes for which he is employed.’” (p. 271, Zirkel & Reichner, 1986)
“[T]he courts have accepted with relative ease the notion that in loco parentis gives rise to duties as well as rights of educators.” (p. 281, Zirkel & Reichner, 1986)
“The status of a parent, with some of the parent's privileges, is given a school teacher by law in aid of the education and training of the child…” (Guerrierri v. Tyson, 1942)
Blackstone assigned three duties to parents that are “transfer[ed] to teachers: maintenance, protection, and education.” (Worley, 2003)
“We are not here concerned with the law applicable to punishment of a pupil by a teacher; but rather with the law applicable to the duties of a teacher in the care and custody of a pupil. In the faithful discharge of such duties the teacher is bound to use reasonable care….” (Gaincott v. Davis, 1937)
There are a variety of ways that a school institution cannot act like a parent and the law carves out limitations and deviations accordingly. But the foundational principle of in loco parentis is that parents are responsible for ensuring the well-being of their child AND when they entrust their child to school personnel, that makes those school folks into caregivers who are likewise obligated to support the child’s well-being.
Marco Rubio’s comment quoted in the meme demonstrates his ignorance of the principle of in loco parentis, ignorance of children’s needs, and/or a reckless impulse that will harm school children.

