Which informal fallacy is committed in the following statement: Your argument that I should stop stealing chocolates from the corner store is no good. You told me yourself just a month ago that you too stole chocolates when you were a kid.

The reply dismisses the argument by pointing at the arguer rather than the reasoning.

The claim that one should stop stealing chocolates stands or falls on its own merits.

Instead the speaker notes that the other person once stole chocolates too.

The opponent's past conduct has no bearing on whether the claim is true.

Rejecting a claim by attacking the person, here the you-too form, is the ad hominem fallacy.