Marinetti seems a little too riled up about The Futurist Manifesto.  His aggressive verbiage, and violent statements seem very immature for such an intelligent man.
Statements such as "Admiring and old picture is the same as pouring our sensibility into funerary urn instead of hurtling is far off, violent spasms of action and creation" seem too opinionated supported with out any reason or fact. I believe the style in which Marinetti voiced his desire towards the eradication of the artistic past is egregious and distasteful.

However art critics, such as Clement Greenberg, would support this contemporary view of art championing Marinetti's ideas as being "avant-garde" to that time frame.  Greenberg also believed in the movement away from old art forms and created new art labels such as post-painterly abstraction
and color field painting; both styles became popular in the late 1950s and early 1960s.  Artists like Morris Louis and Jackson Pollock illustrated these new styles brilliantly by not incorporating subject matter or meaning behind their works, they were pure abstraction.  They did not see reason behind meaningful titles, subject matter, or kitsch paintings.  Instead they focused on brilliant color, action, and open composition allowing the viewer to create their own interpretations of the piece. Fifty years after the Futurist Manifesto, they too moved away from the past paralleling Marinetti's same ideas, "We want to part of it, the past, we the young and strong futurists!" - Marinetti