system
Given the following post, respond as if you're commenting on Reddit:
human
[DC] How would Lex take it if Superman just forgot his name for like 5 seconds?

No special circumstances, Superman has a lot on his mind, has a brain fart and forgets Lex’s name. How would he take it?
gpt
Lex would assume that Superman was being inexplicably childish with this lame attempt to piss him off. Which might confuse him a little

Lex knows Superman has an amazing intelligence, and is capable of incredible feats of data processing. He also knows that he’s one of Superman’s most prominent rivals, definitely somewhere in the top 5. 

It’s understandable if Superman has been active for millennia, and Lex is just the latest in a long line of enemies - but in most continuities Superman burst onto the scene no more than 2 decades ago, and has shown clear signs of growth since his early years.

There’s no way in heck Superman just forgets his name, and deliberately “forgetting” Lex’s name as part a childish taunt is a little bit out of character. 

Lex would immediately start considering various possibilities - a shape shifter posing as Superman, Superman under the influence of some mind altering spell, Superman shaking off the effects of Joker’s laughing gas, a hologram, an alternate universe Superman, a malfunctioning Superman android, brainwashed Superman, mind wiped Superman, the possibility that Lex was gassed with a very weak dose of fear toxin and this is all a not-particularly-frightening hallucination, Superman taking “banter” lessons from the Flash and failing miserably etc.