so far, the best replies that have stopped skeptics are the following:
1. Stanford has a specific page JUST FOR homeschool admissions, lol. yeah.... take up your skepticism w/ Stanford and tell THEM about how wrong they are letting homeschoolers in.....
http://www.stanford.edu/dept/uga/basics/requirements/home_school.html
pay close attention to the last paragraph....
here in the DFW area we have an amazing Homeschool College Night where colleges show up actively courting homeschoolers-- "good" colleges too, not just small private Christian ones,
2. John Taylor Gatto. A NY State Teacher of the Year and 3x NYC Teacher of the Year. That means *other teachers* said the guy was a Great Teacher and Knows His Stuff. He isn't just some two-bit newbie that tried teaching for a few years and decided to support homeschooling, but a GREAT teacher that is rabid *against* the public educational system. So i generally ask teachers [or those quoting teachers] if they are qualified to be a Teacher of the Year at the state level, or at the city level repeatedly. If they aren't, I tell them I'm more comfortable following a more credible teacher's advice.

And even if they are, i simply whip out the "yeah, but another expert + Stanford University disagrees with you."
3. My favorite was being on a Central NY show [HourCNY] as part of a parent panel. I got the guy wearing the "Support Public Schools" button to admit on air that he was basically speaking from ignorance. feather. cap. oh yeah.
4. Best Friends Worst Enemies: Understanding the Social Lives of Children. not a homeschool book, but check it out at the library and turn to page 88. if the edition is different, read Chapter 5, Law 4, about 2-3 pages in. There's a key paragraph I use as a reference that you'll find pretty easily.
My favorite general resource for homeschooling is the Well Trained Mind forums. It has a very diverse community, but if you ask for conservative resources you should be able to find some great ones. About as close to a Hive Mind as you'll get.
good luck!