Open raise SC from button- RRd by loose BB

[CobraGoat]

Villain, in BB, was LAG in position and postflop but folded BB more than 50%.

FT 6max .15/.3

Villain ($70)
Hero ($65)

All fold to me on button, dealt 4 [img]/images/graemlins/diamond.gif[/img]5 [img]/images/graemlins/diamond.gif[/img], and i raise to $1.2.

Sb fold, Villain RRs to $3.2. I call.

Flop: 6 [img]/images/graemlins/diamond.gif[/img]7 [img]/images/graemlins/spade.gif[/img]9 [img]/images/graemlins/diamond.gif[/img]

Villain bets $5 Hero RRs $20. Thoughts? Should i have just flat called here or shoved?

I feel i have been playing combo draws on a big stack very poorly as of late.