I have no particular opinion on this request, other than to note that we'd need a LOT more data to draw any conclusions from it; this is a pretty narrow funnel. But I wanna touch on an assumption that seems to be present in both your proposal here and in a few other comments I've seen today: the current study is not excluding comments from new users. Quite the opposite!
Participants are asked to rate all comments in a thread - including those from new users. For answers, it is not unlikely that both participants in a thread will be somewhat new or inexperienced.
We gotta be really careful here when it comes to making assumptions about where problematic comments come from. Most folks don't have a lot of visibility into this, because comment moderation is both fairly rare and very opaque. Here's the kicker: among the almost 700 users contacted by moderators on Stack Overflow for rudeness over the past year, the median reputation is... 77. Yeah. Keep in mind, these aren't folks who posted one-off mildly-unwelcoming comments; they're the folks who were so persistently abusive to others that moderators had to take 'em aside for a talking to... Still, something to chew on.
As a society, we love narratives that have crisp, clear roles: the ruthless villain, the pure innocent victim, the noble hero... But as Jon noted recently:
The rescuer believes they are making the situation better, but can be enabling the victim's helplessness. Rescuers tend to be disappointed when the victim fails to appreciate their help. Rescuers fail to address the problem created by the persecutor, who often feels like they are the victim in this situation. (In fact, the roles are fluid though one is usually primary.) Often rescuers are avoiding dealing with their own struggles by focusing on other people's problems.
The drama triangle is great for making adventure serials: nothing is ever concluded and you can keep pumping out movies. It's not so great in real life. If you find yourself playing a role in this, you're best off asking if maybe next time you could do things differently - regardless of whether that role involves twirling your mustache or being tied to the railroad tracks...
This, then, is the value of doing a study: to identify situations where folks feel compelled to play a role in the drama, so that we can eliminate them. It doesn't matter if you're new to the site or a 10-year veteran; getting sucked into drama in comments is probably not what you're here for.