Sarah Michelle Gellar’s Goal Is to “Bring Back Everyone Who Has Died” on ‘Buffy’ for Reboot

ssɐqɯnᗡ is likely referring to the fact that Michelle Trachtenberg is ACTUALLY dead in real life. That takes it from awkward to REALLY awkward.

As far as I know she has never said who it specifically was, just that there was a person who made her not want to come back(after a huge fan push to revive her, among the many possible moments).

It has later been revealed by multiple people across several productions that span decades, that Joss Whedon is basically a "good old boy". The kind of guy who finds it funny to mock women. He allegedly has retold a story he found hilarious, about how he made a female writer cry, twice. That sort of behaviour was "confirmed" to happen by by multiple cast members, including SMG. And it is likely why he has no involvement in the new show.

I don't know all the details but I've seen the word 'monster' associated with him