In Season 2, why does Richard accuse Jimmy of making fun of him?

In Season 2, Jimmy and Richard are sitting down waiting for Waxy Gordon I think and Richard says something along the lines of you are my friend? So why did you make fun of me then?

To which Jimmy said of course im your friend, and I didn't make fun of you.

Is this just Richard's insecurity, or did I miss something?

Jimmy is always business and maybe sometimes he isn't super polite to Richard and could perhaps be a bit more jovial but I don't recall him ever making fun of him.

Whats really going on here?

Thanks!