Personally, for me it’s the idea that just because you don’t experience something (dysphoria, or being a gender other than what society expects of you) that doesn’t mean those experiences aren’t valid.
I get sooo tired of the response “I just don’t understand! I love being my AGAB! Why can’t you just get over it?”
Absolutely true, internalized transphobia is kinda the default unfortunately. I didn’t even recognize it in myself until I started actively exploring my identity