Also, here is how Oakland acted when they knocked off Maryville: https://twitter.com/cbrentv3/status/802390498887565312
Notice the consoling, sportsmanship, etc.
https://youtu.be/Ywt-6glidm4?t=10429 This is how Whitehaven reacted in 2012. Notice the fans storming the field and yelling at Maryville players, fans, and coaches. It happened the whole game (I was there, this video doesn't show all...). It's not just "We're from Memphis!" or some other reason that people root against you. It's the reputation your team and fans have.