Okay, what taxes did you pay for this group?
And please don't tell me equal access to public facilities is a form of taxation.
They rent public buildings for prices like $1/year, the military helps them set up their events, etc. Just because the government isn't handing them sacks of cash doesn't mean they aren't using public funds.
The BSA can discriminate against whoever they want when they aren't using my tax money to do it.