Personally, no, it just normalises the idea that alcohol is an essential part of any celebration and 14 is way too young.
Anecdotally, my parents were v strict about me drinking due to problem drinking in the wider family. They drank v little themselves, again having see what it could do.My friends whose parents let them drink at home/wine with dinner etc are all heavy drinkers now, those of us with strict parents aren't.
Studies all suggest that drinking at home makes children more likely to drink, not less.
The whole 'be like the french' idea is bollocks- French people don't drink to excess because culturally it's not the norm, not because it is also culturally the norm to have a small amount of alcohol at home from fairly young. Their whole culture is about appreciating the taste and not drinking to excess.
In the U.K., the norm among late teens/early twenties is binge drinking: slowly introducing your teen to a watered down glass of wine with Sunday lunch will normalise alcohol for them, it's not going to make them take a stand at Emily's 16th birthday and say 'oh I know you've made all these jelly shots but maybe we should just have half a glass of this Cabernet Sauvignon with our dominos instead.'