The irony!
I've lived the past 20+ years outside of KY (in NC), so I think I've only met one UL fan during those 20+ years away from KY. So maybe my experience from >20 years ago is different than how things are now. I grew up in SouthCentral KY, again where UL fans were few-and-far-between, but I then went to college at WKU which has a lot of students from Louisville (including my best friend from college, who was a UK fan). So I was around a lot of UL fans while at WKU. And those UL fans were some of most rude and hateful fans of any team I've ever been around. Now maybe their age (18-22) had something to do with that. But I find it ironic to read a UL fan saying that UK fans are taught hatred (of UL).
To me, I dislike UNC and Duke more (than UL), probably because I live & work among their fans.