my platinum friend says he can out farm a challenger player, and win lane vs a challenger, i would love for someone to put him in his place in a 1v1 real quick, can also tip if needed

Your platinum friend can't even out farm or win lane vs platinums on a consistent basis, so that speaks for itself lol.

You're probably better off getting someone from a discord server or something; but it would be difficult because in a 1v1 setting without enemy jungler presence, it's not the same.

Best of luck!

Was he drunk

i think your friend forgot its easier to farm in a platinum game (where there is less pressure) than a challenger game
basic logic

Sounds like typical ego top laner