When did taika call loki a space orphan? Or did he call both thor and loki that?

Nope, just Loki. It was a Twitter status, here.

And then there was this interview, with this interesting little excerpt:

Thor: Ragnarok’s director Taika Waititi – New Zealander of the Year, blossoming fashion icon, and man of a thousand poses – is swift to launch into a description of Loki, the unbeloved son of Asgard, as, “someone who tries so hard to embody this idea of the tortured artist, this tortured, gothy orphan.”

“Swift to launch into” this description, huh? Kind of sounds like someone with an idée fixe, a preoccupation, a grudge… probably a secondhand grudge, on behalf of one Chris Hemsworth, but one he has made charmingly his own.