The problem is telling them that is what they are doing doesn't help them, because they are tired of their feelings been denied to them, regarded as just feelings, without impact in their lives.
I have tried going the route of trying to explain this simply, like I explained it to you, but I've only been accused of trying to oppress them despite being trans myself and even banned from a few sites online.
Then I have to hear how people think we are all in some sort of conspiracy against gender because some kids are trying to find themselves and we don't call them idiots every time they use their context, the only context they may know, to describe their situation.
Acceptance does not equal support.