why had dolphus raymond made himself into a town outcast? what commentary was he making about the town and its values.

Dolphus allows people to think of him as a drunk and a miscreant to draw attention from the fact that his real "crime" as they might see it, is his relationship with a black woman.

This allows townspeople to excuse his black mistress, and they chalk it up to his drinking. Dolphus only uses the drinking as an excuse to circumvent the ignorance and bigotry of the town. Dolphus simply prefers the company of blacks.

Dolphus confuses the Maycomb community by challenging its neat social and racial categories. He doesn't participate in "segregation, and he has no problem sitting with the African-Americans, nor having children with them. He comes from a prominant family that has money, and doesn't care about the social norms of his society. His actions challenge the town and its racist values.

part of my source