Which is exactly why I respond with "I just don't." To which people usually shrug and move on. Every once in a while I get somebody who is curious or somebody who wants to be an asshole. With the former, I make a joke. With the latter, I change the subject.
Does XMPP support inline photo and video? Last I checked, it didn't. So why deal with the external dependency when you can re-write it yourself with additional features?
If you want to know why, look at the twitter replies. She's being regarded as a Brave Hero of the movement. Bad for a technical employee. Good for a highly visible position, like startup founder, developer evangelist, head of a female programmer outreach program or anything marketing related.
That why violence is really the only answer to bullying. Hit hard and fast, do enough damage in the first blow to make sure neither he nor his buddies want to come back for seconds.