If my son looked like that I'd gather a posse to hold him down and shave it off, just shameful
What...in...thaaaa...???
He looks like an escapee from The Grateful Dead!!!! Or Grizzly Adams! I'd hold him down and shave him silly -- and cut that freakin' mane of his right off! Then I'd punch him in the face for being so silly to begin with! Just for the sheer embarassment of it all...to me...not to him.

The only way I.D.I.C. fits into this is in the word rIDICulous!! He looks like a freak! Probably a nice guy...who knows...but he looks like a freak! Like a cross between a Dead Head gone awry and an escapee from the Peter Jackson Lord of The Rings trilogy!
Looks like that Dwarf character without the helmet!
I'd tell him -- "You can cut that ratty mane and shave yourself or you can get the hell out of my house Mister!". And I'd say it in that Janeway voice too! You know, that pseudo-Hepburn style slight quiver to the voice...I'd mimic it perfectly.
Then I'd bug out my eyes like a lunatic gone mad and punch him in the face again. Just one more time for good measure...then I'd laugh maniacally and scurry out of the room like some insane banshee from hell!
Yeah...that's what I'd do. Mofos!