The argument “Well it did me no harm” doesn’t stack up. We know so much more about the harm this drug causes, alcohol is a scourge on society, it’s the number one social ill.
With that in mind, it falls to parents to help their children navigate the minefield that is social drinking.
OP I agree with your approach and would be beyond angry at being undermined as well as the deliberate swipe at my child’s health.
Alcohol consumption in children (a 14yo is a child) can cause irreversible brain damage.
Research also tells us that the younger a person is when they start drinking alcohol with friends, the more likely they are to develop an addiction.
We know that drunkenness in children and teenagers can cause them to stop breathing.
We know the average age for the first drink is 15, and that up to two drinks of beer or low alcohol cocktails are tolerable by 15+, though far from ideal.
OP’s daughter is only 14, she was given a “few” cocktails, not 2, and may not be supervised.
The party was to be alcohol free. If a child of 14 showed up at my house with cocktails, they would not be invited back and my child would not be allowed to go to their place.
If your daughter chose to drink the cocktails in quick succession, is your husband happy to watch over her until she is sober? If she got drunk and choked on her own vomit, is he cool with having that on his conscience?