During the late 60s I was in a Rock shop in Brighton. The owner spotted my City shirt and commented that he knew quite a few city players personally from the days when he was the Manager.
At first I thought he meant the Manager of the Rock shop, but it transpired that he was Chris Cattlin, the former Manager of Brighton from 1983-1987.
After discussing Gordon Smith, Michael Robinson and the John Bond resignation (City fan allegedly spitting at Bond on the way home from the 4-0 Cup defeat) I happened to mention the Grealish foul on Whiteside.
Cattlin laughed and confessed that Grealish had never forgiven Whiteside for a cowardly foul on the Brighton full back, Chris Ramsey during the 1983 Cup final. Ramsey never played for Brighton again and Grealish took it personally, vowing to avenge the assault.
Coincidentally his debut for City was against United and Grealish promised that he would put Whiteside on his arse at the first opportunity.
As already mentioned, he did this in quite spectacular fashion.
An obvious Red Card in 2013, but apparently he said to Whiteside “That’s for Chris”