A young lesbian couple have heart-shaped lollipops. The one on the left is Black and has her tongue sticking out. The one on the right is white and looking at her girlfriend.

Adults overall

Put aside your beliefs. Don't attack someone whom you don't fully understand.
Don't "ask me intrusive questions about my sex life," especially if I'm not close to you and am under 21.
I know I can be a girl and like "boy things." But that's not who I am. You need to accept my masculinity and that I'm a boy.
"Some adults should work at better filtering what they say, if you're that hateful maybe just don't share it out loud."
"Don't try to convince me that I'll never be my preferred gender, it just causes more pain."
"Try not to push gender norms too much. I'm older (19) so I can discern for myself, but if I were a younger trans man it would be easier to get caught up in toxic masculinity. Some things should not be a thing. Like 'Guys don't paint their nails.' Says who? Better to keep an open mind."
Adults can support me by "showing that they see me as my gender, including me correctly in gendered activities, and using correct gender specific language. Talking about trans people as if i'm not trans (i.e 'those people'), and using terms that don't fit my gender is something that hurts me."
"I just wish my queerness and transness was met with joy (that I had learned about myself and felt safe sharing that) and not with disappointment."
"Many adults support my pronouns and create spaces that don't assume we are in straight/heterosexual relationships. This makes me feel incredibly validated."

Parents

"Before my nephew came out as bisexual, my mom never recognized my calls for recognition as a teen. She has now apologized for not realizing my needs and has said she wished she knew how to support me better when I was young."
"to any parents, please support your children and show them that you support them. neither of my parents support me and due to that we have an awful relationship."