I tried looking up how this has been disproven but couldn't find anything. Can you link?

Here's the clip of the mocking with no commentary: https://youtu.be/biTLe4qNykY?t=31

Make of it what you will - I have nothing to say about it - but it's more than the still image comparing the two people when you google it.

He did that before to non-disabled people: https://www.youtube.com/watch?v=CsaB3ynIZH4. It's obvious media manipulation by the left.

It's quite telling how you're being downvoted when proper evidence is presented that destroys the leftist narrative. They accuse their opponents of putting their heads in the sand, where they are doing exactly the same. Quite ironic really.

You know, I didn't really expect a compelling response to my question, but that does the trick. That's clearly a mannerism he just uses some time.