However, when you make a specific prediction or labeling from the generalized group thing--you are on thin ice. It may be a conjecture a bit better than chance ... or it may not be.
People with the truth/facts on their side are always eager to present them. When people relentlessly say, in effect, ‘That’s for me to know and you to find out,’ they’re just game-playing. It’s straight up obfuscation.