3 people specifically.
A friend from high school, who deleted me shortly after I started transitioning. Funny, because most of the Punks I know tend to be supportive or open minded. We weren't close though so it didn't hurt.
A girl from the local club scene, also not a problem because people don't really like her as she tends to hyper aggressive and overly dramatic.
The last one was a bit more painful, as it was a closer friend that I'd actually visited and hung out with. He had gone to shows that me and my friend played with us, met up at movies, I'd gone out to dinner with him (as a group, not a date), literally someone from an inner circle of friends that I hung with who just deleted me out of the blue after I started transitioning.
Now. On the other hand there are people I personally chose to disconnect with.
As a woman I feel weird hanging with some of my old guy friends. They know I'm interested in men, I don't want to send them the impression that I'm interested in that way with them, others I already had problems with due to the occasional bit of misogynistic vomit that seems to roll out of them and I decided to just cut ties to make things easier on myself. It's hard to be around someone who constantly bags on your values, or doesn't have enough respect for women. Can't say that I miss them but there is a weird space were sometimes I feel guilty for never seeing them. There were times when we had fun together, but most of the time it was toxic and hard to be around.