Okay, my husband and I usually have a drink or two at night to unwind...usually a little more on the weekends. Yes, we drink in front of our son. Yes, I think he should see that you can drink responsibly. Yes, I wait for him to go stay at his grandparents house before I drink irresponsibly.
Now, on the Halloween rolling bar in a wagon idea...the group we trick-or-treated with this past year did this exact thing, and I was APPALLED

(
because I was on antibiotics and couldn't participate)
I agree with the PP's that said that the ones that drink right out in the neighborhood are not the ones you need to worry about...it's the ones that hide it!