Original: Some have called attention to the problem of taking Plato's Socrates to be his mouthpiece, given Socrates' reputation for irony.
Simplified: Other people in the stories often become angry with Socrates because of this! People who study Plato argue about whether Socrates really said the same things that Plato makes him say, or whether Plato just used Socrates as a character, to make the ideas he was talking about seem more important.