Well, what you wrote in your vent is a good response to your effing brother! Then "unfriend" him on FB to teach him a lesson.
Ugh. Sometimes people (esp. family) have this narrow picture in their mind just because of one impression that was made on them, and they think that's the way it is - until someone lays it all out for them. My sister still says shit to me (about me and my life) that is completely inaccurate, but she is only thinking about who I was way back when. Hello? I've moved on, why don't you?
Yeah, things like this are why I appreciate my introverted ways and avoid family functions.