Quick question. (LC)

[Arm187r]

I would like you guys to settle a silly arguement for me.
My brother-in-law thinks I made the wrong play.

Limit 1/2 Pokerstars (10-handed). Just sat at the table.

Hero BB with A9s.

UTG +2 raises PF, folded to me in the BB. I fold.
My brother-in-law points out I have no reads on the table. Says he would call 100% of the time.
Who's play is correct and why.

Thanks