I hear ya. Especially that it makes you want to distance yourself from your t. But the longterm solution is to build a stronger and closer relationship with your t.
Ive been on both the giving and receiving ends of the laughter. One time t was shouting and i found it upsetting. He was like, ugh, i was trying to book a flight! But i was scared as heck to even bring it up.
I hated when "big beautiful women" came out of his office smiling. Hated it! Then i asked him, how am i supposed to "convert" talking about sad stuff in here, to feeling better IRL? How is THAT supposed to work? So now, i try to leave his office on a light encouraging hopeful note if at all possible. Just cuz we're laughing, doesnt mean we're not serious.