I remember in the mailbags, people would use all sorts of fake names, famous celebrities, politicians and fictional characters, and the only time Chris ever caught on that any of it was fake was for Stephen King, and that was only because he was mentioned on a Family Guy episode that same week.
His ability to separate fantasy from reality used to be extremely poor, and now it's non-existent. He couldn't understand the concept of "canon" and "non-canon" because everything had to be "real" in his brain's system. Interestingly enough, the inability to discern fantasy and reality is a common trait of catfishing victims, and Chris definitely qualifies.
He also lacks the ability to recognize people. He had to memorize his own face in a mirror just to imagine himself on adventures. If someone's immediately recognizable features aren't visible, he can't recognize them. That's why he thinks these really bad disguises work: he can't recognize himself, so naturally, he'd assume other people couldn't.
The power rangers suit might have worked if he didn't put on the fucking Sonichu medallion over it and ramble at people about the dimensional merge.