Seriously.
Seriously.
The hair joke has been used so might as well be serious then...well first off Batman hasn’t given up his humanity by forcibly merging with an alien being to give himself up to the concept of Doom/Perpetua in an effort to rewrite reality to how they see fit. In other words, Luthor is evil.
Also Batman is friends with the Justice League, whereas Luthor would probably and did in fact betray the Legion of Doom should it suit his needs. Not to mention Batman has a supporting family system, and Lex has a secretary.
"It's fun and it's cool, so that's all that matters. It's what comics are for, Duh."
Words to live by.
Also, Lex probably has protocols to take down the other members of the Legion of Doom. Batman would never have plans to take down his friends of the League.
...
...
He wouldn't, right?
EYE don't know.
"Never assign to malice what is adequately explained by stupidity or ignorance."
"Great stories will always return to their original forms"
"Nobody is more dangerous than he who imagines himself pure in heart; for his purity, by definition, is unassailable." James Baldwin