Why had Dolphus Raymond made himself a town outcat what commentary was he making about the town and its values?

Dolphus Raymond was not an outcast to the town, but some people did dislike the way he lived. Dolphus Raymond lived with a black or coloured wife and had half cast children. This was unacceptable at that time and place but Dolphus made an excuse so his life would be less complicated. Therefore he pretends that he is an alcoholic so that people can blame the alcohol for his way of living.