There will always be people who don't understand, unfortunately with ABDL, and with bisexuality, it is just something that comes with the territory. They don't understand the feelings we have, they don't want to understand, and so they never will.
But there are some people out there who, whether they understand or not, will accept you for who you are.You'll prolly have to go through some disappointment to find these people, but once you do, those people will be the ones you can rely on as friends for life.
I had said above that all off my close friends know that I am bisexual. For me, unfortunately it wasn't fully by choice, I had never told them that I was bisexual, even though I always wanted to, just so that way somebody at least knew. Then one night they ask me if I was gay. Since all of them were there, I felt like they were ganging up on me, and it was VERY uncomfortable. Once I explained that I was bisexual, because of the awkwardness of the situation, I left. But later on, all of them started asking me questions, they wanted to know, they wanted to understand what I felt and how I felt. It was then that I was 100% sure that these were some of the best friends that I could have.
So, somewhere along the line you WILL find people who will still be your friends, and you also WILL find people who understand what your going through. Again, there may be pain and heartache in the process, which I have had some of my fair share of, and you said that you do still have a very few amount of people who do still keep in touch knowing everything. Enjoy having those few people... Cause I don't know about you, but I would rather have a few good, respectful friends that I could talk to and share my feelings with, than 50 "friends" who truly don't give a crap.
I do wish you luck in finding more friends to share your experiences and feelings with.