Also in Marvel canon Loki's primary function is the fuck with Thor. Thats his thing. Movie verse shows that there is a level of care between them, but of course Thor is logically upset with Loki. Loki feels betrayed by everyone but Frigga who actively searched for him and even did it behind Odin's back it seems. Thor threatening him shouldnt be a shock. Did people forget why the events of Thor even happened? LOKI WAS JEALOUS. And Thor is lest trusting lest we forget Loki shanking him.
god i am having the worst time trying to vocalize this
Thor was the only one in Avngers who gave a shit and made excuses and was like well hes my brother shut up
and then loki stabbed him and now they do NOT like each other on several levels but loki started it all anyway because he's a little shit
and thor didn't come to visit him in prison until he needed him to get to svartalfheim