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He is kinda right, but people that came up with these tools didn't claim it was real. Mathematics is a different, perfect world with no physical constants, which we can later apply to our world inserting in our constants. So you can create a 1-dimensional thing called a line, and study its properties and the knowledge might or might not be useful in the real world, where such objects don't exist. Mathematics approaches infinity and has no limits, I would be bold enough to just call it "a method of thinking".
But it's right that most people don't ask why and simply accept it. I'm sure that some brighter kids understand the concept behind it vaguely and some other kids don't understand it at all, so they don't even have such questions. But we're told that the teacher is an authority indeed and we have to have someone to trust. So if a teacher says it's this way, you as a kid have no means or don't know where to look to verify it. So most people accept their teacher's words as true, because that's a role of a teacher.
Fault lies in the teachers and the schooling system who don't explain it fully, but just teach something seemingly unrelated to reality and teach how to memorize solving equations, instead showing what it means in the real world.
The thing is, those convenient assumptions are the base of maths and that is not a bad thing. We are just animals who do not know the reality. There isn't such thing as mathematics in reality. So all the rules are just our observations and agreements indeed.
