Yes, I went for a job in a West African country. I had been made a verbal offer and the hiring manager was going through some details over the phone. She asked a few questions about me, culminating in asking was I white? When I said 'yes', she said 'Well, that will be a challenge for us. I will need to reconsider the offer' and ended the call. Was not available to speak again, and did not answer my emails. There was no operational reason why the job would need a family link to the country.
I have also been called a 'white bitch' 'white slag' and told that 'caucasians are lazy' in the UK, that kind of thing.
I don't see how that could be described as anything other than racism. Not systemic, as I was able to find another job and can ignore or call out the type of person who makes that type of comment as it is not a regular occurrence.
However, racism does not have to be systemic. That is one important aspect, also the reason some races suffer more deeply. However, I agree that definition needs simplifying.There was a racial aspect to Rotherham, for instance, with the girls reporting racist abuse from the perpetrators (alongside huge elements of sexism and targeting vulnerable victims).
I think it is dangerous to suggest that only some groups are capable of, or can be victims of, a type of prejudice or behaviour due to the current structure of society as everyone needs to be equally protected from discrimination.