Earlier quoted context omitted.
Well I don't want to play professor here, but I don't think you understand the meaning of irony. The fact that you find fault with the implication that women aren't just as likely as men to pursue startups but then say that your girlfriend would do much better than yourself at them if "only she had the inkling to do one" is ironic. You see, you resent the implication that women don't do startups. Your girlfriend does…
The amount of assumptions you stuffed into the reply is simply mind boggling. I'll start by dispelling a simple one: Better half doesn't necessarily equate to girlfriend. Furthermore, the condescending tone and verbiage used in the reply is nothing more than inflammatory. I would disservice myself to continue responding past this point.
The original post was talking about girlfriends, so contextually it sounded like you meant girlfriend by "better half". You're a terrible spokesman for ending sexism as you seem to replace one form of ignorance for another combined with hypersensitivity (having said that, yes the original "joke" was a lame one).