I’m not sure how to tell you this, but it is racist and if you think your example is proof to the contrary you really don’t understand.
Black face originates from a racist depiction of black people and while it may not get the criticism it does in the US, it’s still racist.
A big part of why racism against blacks is such a big topic in the US is because there are so many more than in Europe. There is estimated to only be ~10 million Black Europeans of African descent, while the US has ~42 million. Just because you don’t know someone that it offends doesn’t mean it isn’t racist.
This is the exact same argument I heard growing up in the Southern US. I had something like 10 black people at my school and some of them had confederate flags on their cars. The Confederate flag was considered a symbol of Southern heritage to us, with no malice behind it, furthermore it didn’t seem to offend anyone. All the same it is still racist to fly a Confederate flag.