She removed WashU due to its location – as an LGBTQ Asian American, she (we) are not comfortable having her go to school in Missouri. It’s also a reach for D so she preferred to keep other reach schools on her list instead.
Another poster on this thread suggested the school and its surrounding community are very progressive, so you may find more feedback on that post to help your son: Critique this college visit list? Astronomy and diverse environment search! - #82 by JustVisiting76 Good luck!