I grew up in Erie, PA and saw the rivalry from both sides. The Pittsburgh/Cleveland rivalry transcends sports, its kind of a sibling rivalry
I remember a few years ago watching This Week With Snuffleufflugus. It was the week when LeBron had re-signed with the Cavaliers and Cleveland was named the host of the 2016 Republican convention. Snuffleufflugus round table that week included former PA Senator Rick Santorum. Snuffleufflgus had commented on the good week for his hometown of Cleveland. Santorum, a Pittsburgh native, agreed and made one of the better Cleveland/Pittsburgh observations:
Cleveland is like Pittsburgh's kid brother. It's always fun to beat them up but you're still happy to see them do well