He seems to want to replace all the old guard, whom without Labour would not be here today.
I'm sorry, but I agree with her in that one's appearance i.e colour has a more immediate effect on a person's ability to progress, achieve or even just be accepted in Western society.
Jewish, Irish and Roma people have also been persecuted over the centuries, but not in the way Black African/Asian heritage people have. They have not been owned, shipped, lynched, dehumanised or colonised for their own benefit. Then forced to fight for their freedom and land/resources/countries from imperialist governments, aside from the Irish.
Black African heritage and even darker-skinned Asian people cannot easily assimilate, and were/are often rejected from mainstream society, used and abused over many centuries and in some places even now. Whilst, this is the same with the Roma, they often choose to live that way, some also assimilate if they chose too, though maybe not in Romania or Italy.
I could go on. But, I fear many doing Diane Abbot down for this 'wrong' have no idea of the abuse, the disrespect for a senior politician, just because she's a black woman in a blinkered world stuck in the past. Only certain evils can be acknowledged and remembered. But not our massacres, kidnappings, genocide, theft of land and resources.
Many Black and Asian British people continue to face institutional bias (racism based on your face/name don't fit) in education, health, employment/career progression, law and from the police. But, no-one really cares about those issues except they face it, or those they care about do.