Mr. Z

I think this poem is a complete satire of society. The society is extremely judgmental of race, ethnicity and religion. The fact that Mr. Z isn't given an official name only clarifies to me that this poem is a satire of society and not an individual person. Mr. Z could represent any person who is discriminated against. This character was "taught early that his mother's skin was a sign of error" basically forcing him to disown his heritage and conform to what society thinks is acceptable. The man had to be "careful whom he chose to kiss" and "choosing the right address" which means society contolled every aspect of his life.
The last line of the poem was also satirical. He was classified as "One of the most distinguished members of his race" yet the man did everything possible to disown his race. I think this poem is saying that it's hard to live in a society that doesn't accept your race/ethnicity/religion. People often feel like their only option and opportunity for success is to go along with society and try not to call too much attention upon themselves.