All in a day's work

The picture is seating arrangement set up in our lab.

“That’s got to be annoying, huh” JM hollered across the room to JP.
“Son of a bitch”, JP yelled back, “ Have to move out of this lab. At least move this piece of shit out of the room"
" Why is it here and not it the other lab?" queried JM.
" They moved it when none of us were here." said JP.
" They moved it at night, huh, the bastards" said JM.
" No", said JP " They had moved it before any of us had started here. And its been here ever since because we havent moved it yet into a room thats unoccupied".
" But there are no more unoccupied rooms", JM retorted
" Precisely why we havent moved it yet " I ventured.

Not to be left out of this verbal volley, KH suddenly looked up from his PC and shouted “What?”
“Oh, nothing, they are just talking about the loud buzzing noise constantly emanating from the ice machine”. That was me to KH.
“WHAT” yelled back KH, seated a few inches away “I can’t hear ”
And that’s when I understood the joke.

JM still didn’t get it. He walked all the way to KH and pointed to the ice maker and said “That son of a bitch is too noisy”.
“What the fuck are you talking about J, why can’t you say it out loud? I can’t hear you” shouted KH, at the top of his voice. It was madness by this time. JM still didn’t get it.

“Don’t shout man. We were just mentioning about the ice maker and the noise it makes. Cant you hear it?” said JM pointing to the ice maker.
“WHAAAAAAAT? HAVE YOU LOST YOUR VOICE J? WHY ARE YOU WHISPERING?”
JM, sod him, still didn’t get it.
“I haven’t lost my voice. You have gone deaf and you are screaming. You cant hear the ice maker and you cant hear me. Anyway, its just mindless chatter. Forget it. Never mind” said JM, giving up on KH, and started to walk back to his desk.

KH yelled out JM’s name, and I mean yelled like 'He-man says HEE MANN' and cried “ If you cant speak up like the rest of the others, send me an email” and that’s finally when JM understood KH is impersonating a deaf guy to show how loud the ice maker machine was.
“Son of a bitch” he cursed KH, because the joke was on him and he didn’t find it funny.
It was a walk in the park for KH by now “What?” he asked.
“Mother fucker” cursed JM.
“Send me an email” said KH stylishly and walked out the room.