Is this considered "rude"?

[fluxrad]

Is it considered rude or bad form to announce your hand prior to betting?

I was playing at paradise and had announced my hand on the flop and played it. A few hands later I announced pre-flop, "I have AA" when I actually had 79o. After some aggressive betting I won the hand on the river when the guy laid it down, but my question is...is it considered bad form to do this?

If so, how bad on the scale of poker faux pas?