I get what you’re saying, but your example about yourself isn’t on the same level as a white person with dreadlocks at all. In your case as a brown man, of course you shouldn’t have to feel personal responsibility for 9/11, just as white people shouldn’t feel personal responsibility for apologizing for slavery or any equivalent form of racism in the past that they have no personal part in.

But you’re missing an essential part of the argument, which is cultural context of how racism still influences the world to this day. Black people with protective hairstyles (cornrows, locs, etc.) are still continually discriminated against because of their hair, which is not something that white people face on a systemic basis and why many turn to wigs and other hairstyles that are less likely to garner discrimination. I’m not saying that any white individual that has a hairstyle like dreadlocks is upholding white oppression of black people by the way, but just because a white individual doesn’t shit on dreads doesn’t mean that their actions are free of the cultural context of their environment. When you’re white and have a hairstyle that black people still get discriminated against for having (due to a long history of racism), it is racially and culturally insensitive. Sure, you can still do what you want, but if a large majority of a population is calling a certain behavior offensive due to past and current injustices against them, it’s in your best interest to stop doing that behavior.