How can you be Transphobic, if you're Trans?

"How on earth can I be Transphobic if I'm Trans myself??"
The direct term for Transphobia is "a rejection of Trans identity and a refusal to acknowledge that it could possibly be real or valid."You may not be showing the "valid" part since you must think of yourself as valid. But you are giving the point of whether this case is "real".Say you're Trans yourself, and then your younger brother/sister comes out as Trans too. And you decide you don't want to believe them, and invalidate their feelings in the process, therefore addressing the "real" part of the definition. You refuse to believe that your sibling is being genuine.
I would know this!I have Trans friends myself, and I make sure they know they're valid, but my younger brother, whom I thought was my sister at the time, came out as Trans to me, and I refused to believe it, making the excuse that he was too young to understand.
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But that's actually where a lot of Trans people start out. And it's not something you can control, Gender Dysmorphia can occur at a very young age, you may feel like you don't belong in your body. There are bigger definitions too.
Now with terms.You probably haven't heard of this, but let's discuss Transphobia and Transmisia.Transphobia is showing "fear" or "rejection" of Trans identity, while Transmisia is blatant hatred towards it. Most people in all honesty aren't Transphobic, they're Transmisic, cause they hate the idea of Trans identity.Most people are Transmisic. Not Transphobic.