Drum circle. 420 meet and greet. Riding adult unicycles at the park.

road rage incident, jail or supervilain convention according to the ICD-10 Chapter V: Mental and behavioural disorders reference.

Well, hate and love are intertwined, so there you go.

Okay, so you ask "how do misanthropes find one another".

Depending on mental age/intelligence (fairly exchangeable terms), with mental age approaching the positive direction, people will get a lower or higher number of ideas of what to do about something.

In social circumstances, if a person doesn't know types of people and how to function around them, then they will persistently take themselves away from the insult of their company, and inevitably, we will see misanthropes meet each other.

I can will myself not to google the definition. Too many labels in the population already.