Loki slaps around a de-powered Thor in JIM #147.
In one of the Odin-ring issues (191, specifically), Thor tried to protest Loki's rule, and Odin responded by removing his mouth. Even Odin cannot disagree with whoever wears the Odin-ring. It's a law! (And a really easy to exploit one.)
Two issues later, Loki has a grand ol' feast and tried to wed Sif, bringing up the times Thor refused her.