Aside from their IBS match years ago (which Nick won handily), there are like 4 or 5 clips of Nick treating Ralph like his little jester bitch. He does it in a real subtle way, where he infantilizes Ralph without being openly hostile. I‘m almost certain Nick does it intentionally to fuck with Ralph. Here’s an example:
If you look at Ralph’s history, semi-friendly, light-hearted ribbing gets under his skin more than anything else, because he absolutely
hates to be seen as a joke. It triggers a defensive reflex where he needs to prove himself as a serious person. Nick surely knows this, but he also sees Ralph is all out of aces, and that Ralph needs his audience. At some point, Ralph won’t be able to hold it in.