To me this appears that you intentionally set out to get them kicked out of the conference. You: 1. Tweeted about it 2. Took your phone to take a picture of them [they are "in a public space" or in a private space that allows photography (I'm assuming) but it's still a bit creepy] 3. Tweeted the "offending" rule to the staff.

Don't take this as an attack against you [or even in this situation] However, how would you feel if you were asked to leave a conference from a non-PC comment in a semi-private conversation that you had with someone? How would you feel if that ended your revenue source and/or tarnished your professional reputation?

[My 2c, get off your high horse and be an adult for once: People are going to say things you don't like, get over it. About the photo pit, I find this action extremely uncomfortable.. The same "right" you exercised could be turned around for you.. Someone could start photographing you and make you feel uncomfortable. ]

EDIT: Empowerment has nothing to do about interacting with other individuals. Theres no such thing as a lack of "empowerment" that prevents women from handling the situation with a "ssh" or moving away from the conversation. Could you have even mentioned to the people directly that you're offended, granted you'd look silly as that this is a very minor situation.