i was going to start a thread about this on the disneyland sub until i remembered that there's an extremely pro-BLAB mod who runs the show there and deletes any threads that portray them in a negative light
Hypothetically, I think you have more luck with that group on tossing the softball and letting others connect the dots...
"Need Guidance: I witnessed a man acting hostile on Main Street but didn't see any CMs to tell. What should I have done?"
With a cropped photo from your personal collection with no people's faces in it of Main Street.
Then you write out the entire interaction, referencing happening on Princess Night, but you don't say names. You just describe the couple physically and say that the weird thing is "they looked very familiar" like I had seen them somewhere before. You can even say that you were unsure if they were a husband/wife or father/daughter.
However, the man that they were being hostile towards seemed really shocked and taken back by allegations.