I get it comes from academic research but still by assuming that everyone singing the song has negative stereotypical opinions of black people is making a sweeping generalisation that surely contradicts what she's trying to say. If you the research way you could for example say Lukaku statistically is more likely to have a bigger penis than the majority of those singing the song which i guess are white males and so the song can be backed up by statistics. Not that was ever the case but you can make anything fit an agenda if you want to.
There is a fine line between banter and stepping over the line i agree and as someone who doesn't get offended easily imo i find it hard to get offended by lots of comments/jokes that are clearly meant in a light hearted way but we are in danger over over doing this culture where everyone gets offended by everything and it will only cause more problems. I don't think it's that funny either and i certainly wouldn't sing it about a Wolves player but i just think it's been made a bigger story than it actually is.
I had seen that about Morata and that he doesn't want his name in the song which is fair enough but i would also argue that Chelsea fans usage of the term "yid" is not meant in a light hearted way so Kick It Out and whoever are well within their rights to raise concerns over it. I understand it can be hard to differentiate sometimes and maybe condemning all comments that could be perceived as racist covers it all but it can't be that simple. I mean Spurs still sing about being yids but nothing much seems to said about that, you hear the odd murmur now and again and can guarantee most of those Spurs fans are not Jews now so should they be singing it, i'd more be worried about those sort of songs and the Chelsea one than the Lukaku song.