I hate you AT

[NUReedy]

No hand has given me as much trouble as AT in the incredibly soft 3/6 games I play in at my local casinos. I try to play them the most correctly but am constantly unsure as to what I need to do. Here is a hand that left me dumbfounded (for many reasons) which should become apparent. Help me with how I should have played this hand and other AT hands in the future. Little information on this hand for the players (but I want some of this discussion to be hypothetical for an average situation).
Tattoo-guy is an idiot. Plays 90% of his hands, takes them all too far and is overly aggressive.
Old Guy-Fairly straightward, way too loose. Will try and steal pots if he thinks no one has anything.
Other guy-bad, nothing really more.
Hero-no real image. I am on the tail end of a really bad day, where I have won two pots (one chopped after some guys bad A split my better one), and haven't been making any hand better than top pair. I only have $18 (3BB) left going into this hand, and have decided not to buy in for more and let things fall as they may.

The stack sizes in this hand make it fairly interesting. I'll post my thought process (which I thought was decent) after a little bit.

ACTION:
Preflop: 5 limpers to hero in BB who checks with A [img]/images/graemlins/club.gif[/img]T [img]/images/graemlins/club.gif[/img].
Flop: A [img]/images/graemlins/diamond.gif[/img]6 [img]/images/graemlins/heart.gif[/img]5 [img]/images/graemlins/spade.gif[/img] (This is the spot I always hate with AT, OOP and lots of people in the pot).
Hero checks and is checked to Old Guy who bets. Folds to Hero who calls (anyone raise here). Other Guy in EP check-raises all-in for $6. Tattoo guy and old guy call (he is all in too) as does Hero.

This is one unique aspect to the hand. The two people I believe may have a better hand are all in, and it is only me and tattooed idiot left. Keep in mind I have $9 left.

Turn: 6 [img]/images/graemlins/club.gif[/img].
(2 Players all-in). Hero Checks. Tattoo bets, Hero puts last $9 in and tattoo calls.

River: J [img]/images/graemlins/club.gif[/img].

How should this hand have been played?