You know they'll start testing for the x-gene, same as they test for things like HIV. So donating to spite them's probably not the best idea. Could get traced back to you and then the mansion as a whole, depending on who went with you and also donated.

Better way to handle this is probably talking to Cece or Doc Grey about donating to the hospital in District X. Pretty sure they run their own blood donation clinic there. Sure, you won't be sticking to the assholes who put this ridiculous rule in place, but you'll be helping people closer to home and in the end, that's important.

Besides, there's precedence. All those laws about gay guys not being able to donate and stuff. Or anybody who's had anal sex. Not saying it's right, it's just another way of being a dick, but it's out there. Pick your battles.