Anyone who drinks alcohol, a far more potent and dangerous substance, but opposes legalized marijuana is a hypocrite that deserves to be laughed at and mocked.
One substance is apart of our cultural norm and the other isn’t; but marijuana is a largely harmless drug with many, many medical applications (including getting people off far more dangerous drugs like opioids, antidepressants, etc).
Now don't get me wrong; I'm not a Reefer Madness guy. But there are many users of alcohol who do not wish to be drunk, whereas people who use marijuana wish to experience the chemical high, and that is something different than someone who drinks 1-2 glasses of wine.
Literally every person I know who drinks says they do it because it relaxes them, which is basically the same reason as most pot smokers. There's still some desired mental affect with drinking even if it's not being completely smashed.