The euphoria gained from alcohol is not that much, less than weed for example.
You also lose some degree of motor control and become severely dehydrated if you do not drink enough fluid.
Alcohol is also dangerous to your health and others around you, statistically it is the most dangerous drug by total casualties.
Still it is not bad, if taken in moderation. Some studies actually show a health benefit from taking alcohol in moderation.
its not about having just one glass of wine, what it leads to is a bigger problem then having a glass of wine with dinner.