This is a great illustration of the dangers of lost context.
This excerpt is a bit of the dialogue where Socrates is quoting some legend that takes place in Egypt.
On other parts of the dialogue, when speaking directly, Plato says that anyone can plainly see that writing in itself is not negative.
There is also a great bit where he warns that relying on texts solely to learn without guidance of other learned people opens oneself to misinterpreting the text and learning all the wrong things from it.
This excerpt is a bit of the dialogue where Socrates is quoting some legend that takes place in Egypt.
On other parts of the dialogue, when speaking directly, Plato says that anyone can plainly see that writing in itself is not negative.
There is also a great bit where he warns that relying on texts solely to learn without guidance of other learned people opens oneself to misinterpreting the text and learning all the wrong things from it.
Much like you did.