Affront as a noun can carry a strong emotional weight and imply deep disrespect. The portrait's defacement was a palpable affront to the artist's memory.
Pro Tip 2/3
Cultural Sensitivity
An affront might be culturally specific; what offends in one culture may not in another. Refusing the customary gift was seen as an affront in their culture.
Pro Tip 3/3
Severity
Affront often suggests a serious offense, more than a minor slight. Calling the ceremony a sham was an affront to the entire community.