Green’s Dictionary of Slang

plato n.2

[Mex. Sp.]

(US) a fight, a problem, an argument.

[US]L. Bing Do or Die (1992) 21: He don’t want no ‘plato’ — that’s the way the Essays say it: he don’t want no beef, no problem.
[US]L. Rodríguez Always Running (1996) 66: We can’t go anywhere without some plato.