Looking specifically at fanbases who are entitled, arrogant, overrate their players, have main character syndrome, have a victim complex, and quickly become hostile to their own players/team if they don't meet expectations.
>NFL
Dallas Cowboys
>MLB
New York Yankees
>NBA
Los Angeles Lakers / New York Knicks
>NHL
Toronto Maple Leafs / Montreal Canadiens
>NCAA Basketball
Duke University
>NCAA Football
>EPL
>La Liga
>Bundeliga
>Serie A