I'll start off by saying that I'm one of the most anti-feminists persons I've ever known, particularly towards the radical third wave feminism that emerged in the 90's (I take no issue whatsoever with the initial goals and values of the movement).
However, in this case, even I would be the first to state there's no reason to make a fuss about this.
I'll post the commercial so we can analyze the statement in context:
[YT]SPFduidJGjU[/YT]
I don't think it's meant to take pot shots at men. I think it's made pretty clear she is referring to the person on the phone that she is talking with. Who clearly isn't a boy, but it's played off as a clever excuse to be on the phone with someone while delivering a baby. Immediately after, we see the couple'a reaction, but it seems to be more of a reaction towards Silverman's statement than towards the idea it's a boy. That's just my read on it.
However, let's say for the sake of argument that it was exactly what we're entertaining it to be - a potshot taken at men from the feminazi community.
Even then, so what?
The beautiful thing about a free country is that it allows anyone to voice their opinion regardless of how popular or unpopular it is. Freedom of speech doesn't exist to protect the majority opinion, which in almost all cases doesn't need protecting, it's there to protect the minority one as well.
The problem wouldn't be that they put such type of joke on TV, but that the other side wouldn't have the luxury to do the same. In practice, it should be perfectly okay for anyone to make these sorts of jokes on TV. The solution isn't to censor the feminist side, but to uncensor the other one. Censoring the feminist side would be just an extreme reaction to an extreme situation, and wouldn't really solve anything in the long run.