My policy when people are being unpleasant is to try as much as possible to stick to the facts and let them speak for themselves. This is for several reasons:
1. It's easy when you're angry at someone to paint things more black than they are, or to interpret neutral actions poorly intentioned. Forcing yourself to state the facts helps make sure you're not exaggerating or misinterpreting things. (In fact, occasionally when I've gone through that exercise, I decide that I was overreacting and they didn't mean what I thought they meant anyway.)
2. Laying out the facts is much more convincing. Some guy on the internet says, "He things he's a prince"? Well, OK, one guy doesn't like him. Laying out specific actions he's taken that are consistent with considering himself a prince? Well, now I have data with which to form my own judgement.
Keep in mind that the "prince" thing is not a gratuitous attack or some joke created because of Freenode, it's real:
> In October 2018, Yi Seok, a member of the House of Yi and one of the pretenders to the defunct imperial throne of Korea, declared Lee the crown prince of Korea at a ceremony in Los Angeles attended by city officials from Los Angeles and Jeonju, the family's seat. [1]
I did find that out afterwards, but because of the way the comment was phrased, it wasn't at all obvious. I would probably have said something more like:
> NB that Andrew Lee literally considers himself a prince:
>> [Your wikipedia quote & reference]
> That may have something to do with his governance style.
