As a noun attitudinizer
is one who attitudinizes, or practises poses.
As a verb attitudinized is
To assume an affected, unnatural exaggerated attitude or pose.
*1953 , (Raymond Chandler), The Long Goodbye , Penguin 2010, p. 125:
*:‘That mean anything to you, Mrs Wade?’
*:‘Just attitudinizing . He has always been a great admirer of Scott Fitzgerald.’