If Jake Paul wants to run his mouth and call his older brother a "fake fighter" ... Logan has a simple solution -- "Let's box!!!"
Remember, Jake recently gave his thoughts to TMZ Sports about Logan's upcoming exhibition against Floyd Mayweather ... saying "It's bad for the sport. I think it's just for clout."
Logan is finally reacting to his lil' bro's comments ... and while he mostly takes the high road, he also makes it clear he'll put Jake in his place in the ring.