Why are we even talking about him in the first place? Oh, probably because he decided to leap into the spotlight like that. By publicly demonstrating his exclusively female behaviour (while not all women get pregnant, no men do) he damn well better realize he throws his public masculine identity into question.
We are not defined soley by our reproductive processes. How we are defined involves many things, how we behave, how we appear, how we feel, and how we are treated. If an MTF transsexual spent all her time talking about her testicles, it would make her appear ambiguous, because women don't have testicles. By choosing to exercise his exclusively female reproductive processes in such a public place, he threw his PUBLIC male identity into question. The way he thinks of himself, and the way his wife thinks of him undoubtedly did not change.
Also, no one is claiming he must be EXACTLY like any other pregnant woman. If nothing else, none of the pregnant women I know are on Oprah. However, since there is no such thing as a pregnant genetically male human, he isn't being treated like a pregnant man. He is being treated like a pregnant intersex celebrity.
Freki