I mean like anything; like an apple for example.
I think he was 'being clever' that balloons (he neglected 'helium'), clouds, gases, birds, airplanes,
aren't affected by gravity. Or are they? Does rain, rain up?
Can an unmoving cloud or airplane or bird remain in the sky (no, other forces are 'defying' gravity)? Our atmosphere (1 Mind) is made of gas that 'weigh' something. These items in the air yet affected by gravity.
Speakin' of teachers. The bald guy is a school teacher and the long hair is a certified home schooler.
I throw a ball down, it goes down. I throw a ball to a friend, it does not. Thus Einstein was interested in energy and mass and its relationships and it made 'gravitational pull' change to just 'pull' to describe energies and mass acting upon one another. Einstein believed relativity between objects was more accurate than 'gravitational pull.' However, for many scientific needs, Isaac Newton's formulas work just fine so we still use it and recognize the principles and properties. With Einstein, we have broader application with Relativity. Today, "Gravity" and "General Relativity" are virtually synonymous.