Hands that piss me off: The equity call

Competent reg:

Full Tilt Poker $0.25/$0.50 No Limit Hold'em - 8 players
The DeucesCracked.com Hand History Converter

CO: $22.35
BTN: $54.10
Hero (SB): $55.50
BB: $61.15
UTG: $47.80
UTG+1: $50.75
MP1: $66.60
MP2: $50.00

Pre Flop: ($0.75) Hero is SB with Kc Kd
5 folds, BTN raises to $1.50, Hero raises to $5.25, BB requests TIME, BB raises to $16.25, 1 fold, Hero raises to $50.25, BB calls $34
Really?  I use TableNinjaFT - it automatically sizes my raises.  While playing 12 tables, I failed to realize that raising to $50.25 was not my full stack.  However, BB flat calls with $5.25 behind!  He clearly sees "raise," "call," or "fold."  Is he playing games with his database where he drops an Ace on the flop and he shoves the remaining $5.25?  It winds up working out way in my favor; I get it in as a 86/14 favorite instead of a 70/30 favorite.  What an idiot. 

Flop: ($102.00) Th 6d 4h (2 players)
Hero bets $5.25 all in, BB calls $5.25

Turn: ($112.50) 6s (2 players - 1 is all in)

River: ($112.50) Qh (2 players - 1 is all in)

Final Pot: $112.50
Hero shows Kc Kd (two pair, Kings and Sixes)
BB shows Ks Ad (a pair of Sixes)
Hero wins $109.50
(Rake: $3.00)