Responses

You do not violently pass out after one flute of champagne. Champagne is generally 15% and flute holds ~5 oz.
Even if you weigh a hundred pounds it's still only enough to get your blood alcohol contents to like ~0.04, half the legal limit to drive. This is truly one serving of alcohol. A lot of people get confused about what a serving of alcohol is because most mixed drinks or glasses of alcohol you have are more than one serving. This is the equivalent of a single beer or a single shot.
If you violently pass out after drinking one flute of champagne you need to see a doctor immediately.