They won't care about a 'screenshot' - it could be faked. The CMs (or managers) have the last say, as they are on the front lines. I hope you get help dealing with your issue about breaking down crying and paranoia. I hope you can get past them and enjoy
Disneyland again.
But that's comparing apples to hot dogs. Too short children cannot go in the queue. Tall enough ones can. The second part makes no sense at all - why would someone who has a FP ever have to go in the standby queue?
The double dipping FP/Rider swap with a tall enough child is when the family books FP for half the family (it works up to a family of 6) So they get 3 FP for one ride, 3 FP for another, then ask for rider swap for the other half of the family at both rides, thus getting 3 on with FP and 3 on with rider swap. The tall enough kid actually walks in later on the RS pass! No one is not riding. So families could book 6 attractions if they all had height requirements. I'm glad WDW is cracking down on this kind of abuse.