Being told that "theres a mixed race community and to go there instead" is ignorant

Mixed race is a MUCH bigger umbrella than say the black community or latina community. Even if i were to go to a community specifically for that mix (like half white and half black) that is still such a wide umbrella. Not every mixed black and white person is the same. Not evey mixed black and white person has the same hair texture, skin color, experiences becuase it is such a wide umbrella. We should be allowed in the same spaces as our races we are mixed with so we can better understand ourselves and our part of culture. Being in a mixed race subreddit doesnt cover all the bases. Some of these people arent even a little black how the hell can i relate to them other than the fact im mixed? I want to embrace both my polish and African american roots but have had some push back from both sides.