I completely agree. I remember in highschool I wrote a paper about this. Weed was completely illegal back then and I never understood why alcohol, which seems more dangerous was socially acceptable. It's interesting now they are both legal and there is still additional stigma around weed. Makes no sense.
Discussion
Unfortunately it does make sense when most form their opinions based on what TV experts tell them.
It's typically the older generations who still cling to this idea too. It's harder to profit off something that anyone can grow...
Many people don't care for weed or drug culture.
Alcohol occupies a unique place at it's both an intoxicated and a fermented beverage.
I once heard a phrase that "You don't have a culture if you don't have cultured foods."
Many people historically relied on fermented alcoholic beverages like beer and hard cider as one of the few safe things to drink, since the alcohol kills pathogens and serves as a preservative.
Alcohol consumption also lends itself to more of a social lubricant than cannabis.