There may be areas where that isn't the case, but you can probably count those on one hand, sadly.
on the whole, yes, it is.
however, I am currently dating a guy that is of mixed ancestry, and looks exotic, but is definitely not a white guy, meanwhile, you see what I am in my avatar pic here, so, it's not always a thing, I think it has to do more with the racicm and sexism we encourage in schools still, kids group together by race and sex in school, then they start ridiculing those "not of their cloth" and we get bullying.
I would say yes. I may not look it in my profile pic (I've got Goth face on) but I'm Latina/Brown. I've had trouble when I'm the only WoC in a support group, either a general one or a specifically trans one. Also, when I was attending Grad School in Detroit, you could literally see the divide between the white students and AA students in the campus support group.
Part of it however is that ethnic minorities have our own particular stressors unique to our communities. For example, several of my students were gay AA men and preferred to remain on the down low. There would be arguments about how they are hiding in the closet but the AA community has its own social norms that make that very difficult to do without losing one's entire family.
Another example would be the Latin side of my family's response to my transition. They will accept me as a woman, use my preferred pronouns et alia but Gods forbid I have surgery. That would be 'mutilating' myself and a disgrace.
Sorry for rambling ^_^
When I was growing up in school all 7 gay guys in my school were white, skinny, shallow people. I hated for being the 2nd skinniest and being 1/4 Maet and I they never dated me or wanted to ever talk to me... :D lol
We had about 15 girls who were gay in our school. One is African American and dated one of my good red heads we call Brave ;D and the rest are white with one as 1/2 Navite American and 1/2 jewish.
These two girls are the only african americans and native americans in my school. I only got along with the native american one because we knew eachother since grade 5. From my perspective everyone in my city treats them equal. But when I moved out to the hill billy region of no mans land... there is older Native American LGBT that are treated sooooo poorly. I'm just like her for living in an all white place. I am very thankful my Great Grandparents are native American and I wish I could've met them to learn more. I also wish I could've grown up with different cultures than what I did grow up with. Maybe the growing up experiance would've been different for myself, and the two girls.
I've always liked to think of Orange County as the Connecticut of the West - where the whites keep down the other whites.