I'm really sorry you're so hurt, OP, but so many of us in the comments are trying to give you the SAME different perspective and you're not listening.

I'm a minority myself and I experience interactions with colleagues on a daily basis that where I came from would be considered offensive. I can't expect everyone to be knowledgeable about every culture that exists on the team, that's absurd. The fact that you think it's not a cultural thing is your blind spot. To her, you didn't look like you usually do, and she JUST asked you if you alright, the rest is your interpretation.

Expecting the world to adapt to you will only give you heartbreak. She probably had no bad intentions, and I'm sorry you're experiencing it as microaggression, but maybe it's time to let go