I see. You should maybe know that while it's true in a sense, a lot of people don't like that phrase very much. It's a cliché cryptocurrency fans recite in response to any issues with cryptocurrency exchanges and I among others feel it serves to downplay the responsibility of the exchanges and blame the victims.
Securely taking care of an offline crypto wallet is somewhat more complicated and technically involved than just having an account on an exchange site. That the easiest way to use cryptocurrency is also an insecure one speaks of a major usability problem in the whole ecosystem.
More importantly, exchange sites offer what is essentially a bank account with little of the accountability of an actual bank. If a bank gets hacked and loses all your money or freezes your account for frivolous reasons, people generally don't go "well you should have stored your money in cash inside your mattress instead". (I guess some do, but they deservedly get the stink eye from people in polite society)
I dislike cryptocurrencies and have little trouble having vindictive schadenfreude when coiners and their platforms keep being embarrassed time and time again, but I know the real problem are the corporations and the tycoons, so I don't like their responsibility being shifted on the least informed and most vulnerable group of retail users, who are also the most likely ones to use these exchange platforms and thereby not hold their own keys.
Imagine being afraid of allusions to classic literature in your own native language.
It's fine to miss a reference. I do it all the time and make my friends do the same. Not getting a reference is not a punishment to you, it's a bonus to those who do get it.