I've got no qualms and plenty of perspective when it comes to "coming out" to friends and family, and sure, maybe I'm one of the lucky ones in terms of received responses. But nonetheless, if you do, and the response is less than ideal, you have to suffer the consequences and handle what comes of it.
I'm not saying any youth should or shouldn't be honest with themselves and those around them in regards to their sexuality. I'm saying: you've lived with your parents for most if not all of your life at this point, and if you haven't figured out what their stance on homosexuality (or alternate, non-heterosexuality) is, then you haven't been doing your homework or paying close enough attention.
If you have a blog, and it's posted on your blog, especially if you're still living at home or financially dependent on your family and parents, you should be willing to expect the worst and capable of dealing with it. Even if you've never mentioned directly to them that you have a blog, or spoken of what kind of content you post on it, they'll still probably figure it out. Any parent worth their salt keeps up with their children's internet activity, whether the kids are aware of it or not.
I mean no respect to Kate Koenig, but that's the long and the short of it. You made the choice to post the information on the web, you have to deal with the consequences. I wish you the best of luck, but you'll get no pity from me.