This post is about targeting ads at certain demographics. Those ads happen to be for jobs.

Exactly, and job seekers over 40 are a protected class, so this is illegal discrimination.

I'm curious if we have the same vigor over Strip Clubs?

They have been operating outside of this law the entire time. Are we supposed to respect this law now, even though everyone in this thread knows its unenforced, unenforceable, and is being broken constantly?

I'm supposed to be outraged by the natural evolution of online ads, though. And at Facebook.

Strip clubs are discriminating based on "a bona fide occupational qualification reasonably necessary to the normal operation of the par­ticu­lar business". That is explicitly allowed by ADEA. Most businesses don't have the same excuse.

Doesn't this exception leave room, then, for Facebook to allow employers to decide if their ad targeting breaks the law?

If I'm a strip club owner and I want to promote a job opening on Facebook, I have to waste impressions on 45+ year old males because of this issue?

So your argument is that it's ok to do it because strip clubs do it? If you try to get a job at a strip club and they turn you down for being the wrong age (or some other protected attribute) then you're welcome to take them to court. That doesn't change Facebook's risk exposure here.