Brilliant Strategist or Tilting Luckbox? You decide

Another last hand of the night- box already checked to sit out the next hand (where I move into the big blind). I've had a rough night, down a buy-in. Playing well, but getting outflopped. I'm almost disappointed to see pocket kings here, I'm ready to just take my lumps call it a night.

Merge, $0.05/$0.10 No Limit Hold'em Cash, 8 Players
Poker Tools Powered By Holdem Manager - The Ultimate Poker Software Suite.

MP2: $11.01 (110.1 bb)
MP3: $5.08 (50.8 bb)
CO: $10.66 (106.6 bb)
BTN: $8.74 (87.4 bb)
SB: $10.59 (105.9 bb)
BB: $11.58 (115.8 bb)
Hero (UTG+2): $10 (100 bb)
MP1: $8.64 (86.4 bb)

Preflop: Hero is UTG+2 with K K
Hero raises to $0.35, 4 folds, BTN calls $0.35, 2 folds
BTN is a 35/30 after 65 hands, with a 5.0 aggression factor. Greaaaat.

Flop: ($0.85) T 8 9 (2 players)
Hero bets $0.20, BTN calls $0.20
What a crap board. My .20 bet is a misclick. It's official, I'm tilting.

Turn: ($1.25) 4 (2 players)
Hero bets $0.83, BTN raises to $2.08, Hero calls $1.25
And now we have a flush and a straight on the board, with an aggro opponent raising me. Well, I've got the flush redraw, right...

River: ($5.41) 5 (2 players)
When the river bricks, I take a quick peek at his stats again. Looking for a reason to call the bet I know is coming. His river aggression factor is low (most of his aggro tendencies are on the flop). I can't find a reason to call it. I'm screwed.

Hero checks, BTN bets $6.11 and is all-in, Hero calls $6.11
I call anyway.

Results: $17.63 pot ($0.88 rake)
Final Board: T 8 9 4 5
BTN showed A J and lost (-$8.74 net)
Hero showed K K and won $16.75 ($8.01 net)