@da, oh I get you, you don’t learn kabalah, and make fun of the baal shem tov, toldos and the baal hatanya because they teach cabalistic ideas that you never heard of! Correct?
Avos 1:1, in other words there is no source. R’ Yehuda hanasi saw that Torah was being forgotten so he wrote it down, still looking for where this “mesorah” idea comes from.
Jews always learned kabalah,
Btw mesilas yeshorim is based on kabalah, and the first perek the purpose why a jew was created comes from eitz chayim.
