Pastor Troy Ashley's sermon on "Generational Idolatry" based on Exodus 18 emphasized the significant role of the older generation in the church, discussing topics like discipleship, accountability, and mentorship. He highlighted the importance of older individuals within the church community, encouraging them to embrace their valuable role and impact on families and the church. The sermon explored different generational tendencies, calling for humility and repentance to break the cycle of generational idolatry. Pastor Troy emphasized the need for older individuals to mentor and invest in the younger generation, while encouraging the younger generation to seek guidance and wisdom from their elders.