I’m just going to say this now and then go back to my business.
No one should ever feel guilt or shame for the colour of their skin, their culture, or their heritage.
You have nothing to do with what the generations before you may or may not have done (groups of people did not all follow the same moral path down to a T, unlike what history books would imply).
If someone tells you you’re scum for not constantly apologising for who you are, that’s silly and you shouldn’t let them pressure you.
If they imply that you have to repay some kind of moral debt to every culture that doesn’t match your skintone (by their definition) for the rest of your life, they are conveniently ignoring/erasing what wrongs their culture has committed.
If someone treats you like this, they’re not only a bully, but ignorant as well. And if this utter lack of kindness and logic is due to the colour of your skin, then they are racist on top of that.
Don’t fall for it. Don’t give in to it. People should be seen for how they act as a person, not for what their race is (to reword words that fall on deaf ears lately).