It is just a point to be mad, about how people seem to misunderstand things. Personally, I'd rather smoke than drink anytime, because it is cheaper and I don't feel like crap the next day.
The reality of the argument is that people should be allowed to do with their bodies what they want. It in no one harms anyone if I choose to smoke before playing video games or eating some left-overs (best way to make them taste better), or hell, even going out with friends. The worst I've seen a stoner do is just sit down and zone out. Not exactly dangerous to society. It tends to make people more passive, and easier to deal with often. When I did food service, I never had an angry stoner come in. If we didn't have a topping they wanted, they were just like "oh, well, whateva." Sober and drunk people were often more stressful to deal with.
Alcohol also tends to impact memory a lot more, at least in my experience. I have hours and hours of nights that I will never, ever remember. Pot on the other hand tends to just make things fuzzy, but you ultimately can end up recalling stuff. Again, that is just my experience.