I'm personally happy to call with the nut flush draw or nut straight draw after I've been aggressive. I think at 6max you've got to be aggressive and be seen to be aggressive and happy to get your chips in. But really you're playing quite a tight range of hands.
My thinking as well, was that you'll be getting near enough, if not the correct odds to call anyway (as the prev betting has swelled the pot) - obv if you're both deep stacks it could be the wrong move - again this was a general guide on how to play, and how i beat the 6-max microstakes - some common sense is needed. People show up with such weird hands down there, when you've been aggressive and have a good hand or a draw to the nuts I say get your chips in.