When we cant deal with it
when Alastor was human has was constantly used and bullied for his skin and hair. Now in hell he hides a lot of his characteristics for example his HATE for touch and forces himself to deal with it.
or
Alastor is to tired to deal with acting 'normal' and just does what feels comfortable.
or
Alastor angst, its good give it a lick before throwing it away.