Hand from a tough session - advice?

[lstream]

Here is the order of his cards as shown by the hand history:

Kh 3h 6h 3c 3s 9d 6d

"threes full of sixes" as Party would say.

[RayGarlington]

I see. I had assumed he had started with sixes.

[ddubois]

How large of a mistake would it be to always mindlessly fold 4th street when you've bricked 4th? I intend to mean including otherwise ideal circumstances for your hand (like 3 to a straight flush with 0 dead cards, and multiple overcards to your opponent's board, who happens to be a manaic and could be betting air).

[SittingBull]

UR oppo. rivered u.
U were the BOSS until U were replaced with a new boss.
SittingBull