Aces Full not strong enough?

This is a ghey hand I was in this afternoon:

Full Tilt Poker Game #4885277530: Table Stonewater - $1/$2 - No Limit Hold'em - 19:25:33 ET - 2008/01/16
Seat 1: OLE BILL ($150.90)
Seat 2: s_twentyone ($176)
Seat 3: BP ($195)
Seat 4: Rake Feeder ($272.50)
Seat 5: YATittle14 ($188.15)
Seat 6: Cohete Punch ($199.60)
Seat 7: AAvKK ($229.80)
Seat 8: rean1mator ($154.25), is sitting out
Seat 9: Shabambu ($262)
Shabambu posts the big blind of $2
The button is in seat #7
*** HOLE CARDS ***
Dealt to Rake Feeder [4d Ad]
OLE BILL folds
s_twentyone folds
BP calls $2
Rake Feeder calls $2
YATittle14 folds
Cohete Punch folds
AAvKK calls $2
Shabambu checks
*** FLOP *** [Ah 5h Ac]
Shabambu checks
BP checks
Rake Feeder has 15 seconds left to act
Rake Feeder bets $5
AAvKK folds
Shabambu folds
BP calls $5
*** TURN *** [Ah 5h Ac] [2h]
rean1mator has returned
BP checks
Rake Feeder has 15 seconds left to act
Rake Feeder checks
*** RIVER *** [Ah 5h Ac 2h] [4c]
BP bets $18
Rake Feeder raises to $40
BP calls $22
s_twentyone adds $24
*** SHOW DOWN ***
Rake Feeder shows [4d Ad] a full house, Aces full of Fours
BP mucks
Rake Feeder wins the pot ($95) with a full house, Aces full of Fours
*** SUMMARY ***
Total pot $98 | Rake $3
Board: [Ah 5h Ac 2h 4c]
Seat 1: OLE BILL didn't bet (folded)
Seat 2: s_twentyone didn't bet (folded)
Seat 3: BP mucked [As 2s] - a full house, Aces full of Twos
Seat 4: Rake Feeder showed [4d Ad] and won ($95) with a full house, Aces full of Fours
Seat 5: YATittle14 didn't bet (folded)
Seat 6: Cohete Punch didn't bet (folded)
Seat 7: AAvKK (button) folded on the Flop
Seat 8: rean1mator (small blind) is sitting out
Seat 9: Shabambu (big blind) folded on the Flop

What does it take for the guy to re-raise me? He had Aces Full, why didn't he re-pop me? I can understand being cautious with a weak ace, but he was full!! He should have re-popped me and gotten stacked!