While there is certainly blame to be had on all sides...your characterization of Aemond here is just as twisted as the one you rail against. Aemond was about to brain his nephew with a stone in that "childhood brawl". The dragon should have gone to Laena's daughter.
Let's watch that scene again:
Aemond fucked around and found out.
Team Black vs Team Green is complicated when it comes to the actions of the adults... but the children? At this point, the worst that the team Black kids are guilty of is bullying...which is cancelled out by the bullying of team Green. Meanwhile on team green you have the rapist and the attempted murderer. Yeah, Luke maimed Aemond...but he was defending his brother and his cousins.