1.
non-drinker; person who prefers sweets to alcohol
A person who does not drink and prefers sweet things; an older, somewhat playful word, the counterpart of 左党 (a drinker). Close in meaning to 甘党.
My friend who drinks and I who don't enjoy drinking parties in different ways.
右党 is the counterpart of 左党 (a drinker): someone who doesn't drink and would rather have something sweet. It can also mean a right-wing party, but that use is rare.
This is an older expression that is still understood but less commonly used in modern casual conversation, where 下戸 (non-drinker) is more typical.