Thor's musculature and tissues are considerably denser than an ordinary human's. During Vader's tantrum at the end of RotS, we saw him crush parts of the wall which are also considerably denser than human jiggly bits. And that was likely done unintentionally. If he focuses, he should be able to exert enough force on Thor's windpipe to cut off his air supply. Thor's not made of stone or metal - his flesh still has give to it.
But, Thor isn't some scared Imperial admiral. Start to Force-choke him, he's not going to just tug at his collar and spit. He's going to call down the storm on the other guy.