This and other pearls of wisdom can be found on the comments of this thread. Yes, pregnant women deserve no extra consideration, and it’s really up to them for other people to give up their seats.
Actually, the latter point isn’t totally off the wall. There is a part of you that worries that offering a seat to someone you deem to be pregnant can backfire if that woman is in fact not pregnant. And sometimes passengers don’t pay attention to other riders getting on that deserve the seat more than they do. But that doesn’t excuse the boorish behavior that some are either defending or even exemplifying.
The comments are truly revealing about a certain mindset among urban hipsters. At least this time no one has used the phrase “f$%^ trophy,” though there’s still time.