NL50 Dfending the BB with suited connectors

[JROK777]

Full Tilt Poker
No Limit Holdem Ring game
Blinds: $0.25/$0.50
6 players
Converter

Stack sizes:
UTG: $47.70
UTG+1: $41.70
CO: $9.90
Button: $50.00
SB: $58.35
Hero: $74.30

Pre-flop: (6 players) Hero is BB with T[img]/images/graemlins/spade.gif[/img] 9[img]/images/graemlins/spade.gif[/img]
3 folds, <font color="#cc0000">Button raises to $1.75</font>, SB folds, Hero folds.
Uncalled bets: $1.25 returned to Button.

Results:
Final pot: $1.25

Just curious what kind of connectors + 1 gappers you defend the BB with in spots like these? I assume there's a difference depending on the read of the player raising. Against a 22/19 type player is this an auto 3 bet PF? I've been folding these unless there is another caller in the pot already.