We know this guy.Brad Sloan’s (Ben Stiller) life hasn’t turned out as expected, and now, on the eve of a college tour in Boston with his charming and musically gifted teenaged son Troy (Austin Abrams), he is consumed by self-doubt and envy.The world is no longer in love with him, and director Mike White’s “Brad’s Status” is the road trip through Brad’s mind on his quest for midlife self-respect.Brad lives in Sacramento, Calif., with his wife Melanie (Jenna Fischer, The Office) and …