duchamp vs. matisse

my dad showed up tonight and one of our conversations was about ken burns's new documentary on andy warhol. my dad was very happy that burns parrots someone who declares warhol the most important artist of the second half of the 20th century. dad was bummed though that the label of most important artist of the first half went to picasso. he adamantly believes (while still liking picasso) that the title should go to either duchamp or matisse. usually dad leans duchamp.

i wonder if other people have conversations like this with their dads. i'm guessing no.