I’ve never liked that title. We were Manly before being Manly was a thing. We’re the originals with the hate for us starting with the Packer funded 74/75 premiership sides. Manly hate came soon after with their player raids and then cemented with Arko taking over the game.
74/75 is before I was born. My earliest memory of the game is probably about 92 when I was living in Victoria. The only teams that were on TV (and as a very young kid I used to watch the games at around midnight) were the Raiders (that’s why I go for them), Broncos, Manly and the Bulldogs. Maybe St George as well. Great times. Anyway I remember that’s when the Manly hate was big (with Arko there as well)
The Roosters hate for me came in the mid to late 90’s when you bought Fittler and a few others and had a shot at a few of the Raiders during the Super League war.