Some speak as though, they were never taught. Some even say it.
Nobody taught me.
I learnt from no one.
That's funny. Very funny.
They give credit to nobody. They never mention their teachers. They never associate with them.
They think it is deriding to do so.
They are wrong.
They think doing so means you're not original.
They are also wrong.
They are fueled by the media that hypes "self-made", as if it were a thing.
There's no one completely self-made.
Gladwell noted in Outliers, we all owe something to parentage or patronage.
There's nothing wrong in making reference to your teachers.
Nothing wrong in giving people credit if they inspired you. Nothing wrong in quoting who you learned from. For one it shows you're worth listening to.
Whoever says he learns or learnt from no one is a fraud.
Even Clark Kent was taught a thing or two by Jonathan Kent.
Your teachers could be anybody; parent, guardian, school teachers, friends, colleague, boss etc.
Reference them when you need too. If peoples words and wisdom have inspired and influenced you, quote them. It's not demeaning.
Those who write about "self-made" are laughable.