I think he always claims it is a "Roman Salute", he also spoke about his admiration for Mussolini in his autobiography and - I think - said he is a fascist.The thing about Italy is that they will not describe it as racism but culture. Fascism ( Roman fascism) is part of that country’s history and many groups are steeped in it. Paolo Di Canio has numerous times been seen saluting the fans after scoring - saluting using the nazi or fascist salute. Not a pretty sight but I don’t think he is racist.
Can't recall him ever being involved in any racist incidents though ?
When he was at Celtic I think he was involved in a bit of charity work and was generally regarded as a bit of a combustible personality but likeable with it.