Max has really disgusted me.

[The One and Only...]

Why don't you consult your philosophical dictionary? Or get one?

From my college-level philosophy course textbook:

Idealism: In metaphysics, the theory that all reality consists of mind and its ideas.

Plato: (427-347 B.C.) The first great systematic or synoptic philosopher whose work survives in real quantity, propounder of transcendent Forms (or essences) as the absolute realities which are imperfectly mirrored by things in the sensible world and are known through the intellect alone.

Note the very, very, very major differences in idealism and Plato's philosophy.