I'm not proud

Ben's been working on the letter 'F' at school. And sometimes he's had a bit of trouble. For example...

Ben: I have one mommy. Fumb. Fah fah fumb.
Mommy: No Ben that's thumb. Th th thumb.

So later on today you'd think I would have been proud when he came up with another 'F' word.

Ben: F*ckin'. Fah fah f*ckin'
Mommy: No Ben that's a bad word. We don't say that.
Ben: But it's an 'F' word.
Mommy: No Ben. We don't say that ever.
Ben: Awwww....I wanted it on our chart.