He's using PSYCHOLOGICAL warfare.
We must reply in kind.
The Big Bang Theory Season 1, Episode 13
...you may be alone
because your PSYCHOLOGICAL state...
The Big Bang Theory Season 4, Episode 5
One is a deep-seated
PSYCHOLOGICAL disturbance,
The Big Bang Theory Season 12, Episode 8
Trust me, Kripke will fall easy prey
to my PSYCHOLOGICAL warfare. Observe.
The Big Bang Theory Season 2, Episode 12
Yeah, she's right. For every Newton
who had a PSYCHOLOGICAL issue,
The Big Bang Theory Season 9, Episode 10