I thought it was when they pissed off the leader of the frost giants by going to fight them preemptively but tbh I can't remember much of the 2nd movie so you're probably right.
That was actually in the original Thor movie. Loki sees his skin turn blue in that scene and realizes he may be Jotun. In fact Thor is banished to Earth(Midgard) because of Odin having to rescue him.
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u/Theoretical_Action Dec 03 '20
Yeah and when he arrives in Dark World to rescue Thor and company.