Sorry to hijack the thread but I had a similar issue with this hand, is this standard or weak? Does everyone fold the flop without a raise? (I would have raised if it was HU)

Blinds: $0.12/$0.25

UTG: $15.58
UTG+1: $23.25
MP1: $44.54
MP2: $18.01
Hero: $24.63
CO: $31.37
Button: $5.11
SB: $65.77
BB: $23.67

Pre-flop: (9 players) Hero is MP3 with Ad A♠
2 folds, MP1 calls, MP2 folds, Hero raises to $1.25, CO calls, Button folds, SB calls, 2 folds.

Flop: 5♣ 4♣ 6♣ ($4.25, 3 players)
SB bets $3.57, Hero folds