I think it's the implication that anyone that works for facebook is inherently immoral and exchanging their own ethics for cash, which is not true imo.

There are lots of great people doing great things at FB, and if we apply this standard to FB we should also be applying it elsewhere. I'm not entirely sure many major companies have been completely controversy-free... Work for Apple? well you are complicit in sweatshops. Work for Uber? Complicit in sexism and workers being taken advantage of. Work for Spotify? Complicit in artists not getting paid what they should get. I would be interested in hearing where I am allowed to work if we follow this to it's conclusion.

(NB: I don't work for facebook or any of these companies...)