Timonist

Yet was he not … such a Timonist, but hee would familiarly conuerse with his friends. [sic]

I did it to retyre me from the vvorld; / And turne my Muſe into a Timoniſt, […]

Cynicism is often contrasted with "Timonism" (cf. Shakespeare's Timon of Athens). Cynics saw what people could be & were angered by what they had become; Timonists felt humans were hopelessly stupid & uncaring by nature & so saw no hope for change.

Marston poses as the Timonist malcontent satirist ready to excoriate the world for its follies.