You deal with racism everywhere you can, and, moreover, football is a very prominent part of society. Why not deal with racism in football? It's a weird take at the very least - everyone in football has been trying to deal with racism in the game, and thus society, for as long as I can remember. Do you think they're wrong in doing so?
This last bit is interesting in the subconscious bias element of prejudice. "Othering" people who are unlike what you are used to is a chief vehicle of racism, subconscious or otherwise. This includes criticizing too severely compared to people who are like you, grouping people who you perceive to be different than you together, judging others differently, simply not making an effort to go beyond the biases that make you "get" people like you and make out others' attitudes and actions to be wrong or misguided, among an assortment of other attitudes.
Whether or not Sounds is racist, why are some acting as if a 70-year-old Scotsman fixated on criticizing a black possibly espousing racial biases would be a terrible shock?
I have no idea whether Souness is racist or not and I'd like to give the man the benefit of the doubt and entertain other possibilities without jumping to conclusions. It seems fair to assume that maybe he's just detestable to people of all races.