Wait a minute.

You said it is immature to call someone a liar, yet in the next sentence you concede his claim was not true, that he was "full of it."

So then by your logic it is mature to claim someone is full of it, but immature to claim that they told a lie?

You are attempting a level of subtlety which exceeds your grasp.

Like LarryS. I don't care if Singer stays or not, he IS colorful, but now I know to question and not accept anything he says at face value.

Alas and alack, that level of skepticism is reserved for (wait for it, I am wearing my mature-man pants) guys that are "full of it."