By Bonnie Stiernberg We’re now on Day 2 of Will Smith slap discourse after the actor shocked the Oscars on Sunday night by smacking Chris Rock across the face for making fun of his wife’s alopecia. At this point, it feels as though everyone under the sun has weighed in with their take. “But wait a second,” you’re probably saying. “What does The Strokes frontman Julian Casablancas have to say about all this?” Finally, we have an answer, thanks to a new Instagram post by the musician. In it, Casablancas defends Chris Rock and rails against Smith, alleging that because Rock is “kind of a slender …