The key phrase here may be who will say. Not enough malpractice insurance in the world, babe.
My own dear mother drank one martini each day during my gestation (this being back in the day - she did quit smoking for the occasion, though) which may or may not explain a couple things but didn’t produce any of the horrors you describe.
Now while I wouldn’t encourage a pregnant woman (or anybody, for that matter)to ingest addictive substances, I suspect the no alcohol instruction is because it’s easier and safer to say NO ALCOHOL than to point out to patients that addictive substance consumption is a medical roulette, depending on a combination of individual genetics and outside factors.
Note to the OP: your neighborhood Starbucks and restaurants may be refusing you service because they’re worried about a lawsuit, rather than personally outraged. I suspect they’re keeping a close eye on the lawsuits that assign blame to tobacco & gun manufacturers and are trying to ward off a suit that begins You KNEW I was pregnant and yet you…