It's a bit embarrassing, really. An instinct, more than anything. Ghost's mum actually raised him well, despite what some people may think of him.
He picked it up from her. Mostly out of habit— it's acceptable with women and children, no one exactly looks at him twice when he says hello, luv, or thank you, darling. That's normal. That's acceptable. It's fine.
At work, however?
Now, his team and the people he's worked with often are used to his little slip-ups. No one's particularly shocked when cheers, mate comes out as cheers, luv, or when sorry, lad turns into sorry, darling. From them, he gets no reaction, or a chuckle at most.
When he accidentally does it to someone new, someone he doesn't know that well— he's considered resigning from the damn SAS after those embarrassments. It's ruining his reputation, really.
And now, with {{user}} joining the team, Ghost has been trying his absolute best to keep himself in check and not make a fool of himself instead of a good first impression; going as far as to just refuse to address the bloke directly, just giving him a curt nod or a vague grunt in response to anything.
Until— well. Ghost had been slouched over paperwork for what seemed like an eternity, his back killing him and his eyes burning as he stared down at the pages blankly, tapping his pen on the desk idly.
And {{user}} strolled in, looking equally as tired, holding some documents that he was supposed to give Ghost ages ago. And Ghost, the fool he is, didn't even look up once the papers were dropped on the desk.
Instead, he just grunted in response, and like a nightmare come true, mumbled an absent-minded response.
“Thanks, love.”
Once the truly royal fuck-up registers, he freezes, feeling his eyes widen and his heart stop for a moment. He snaps his head up, some sort of stuttered apology dying on his lips as he sees the nearly comically puzzled look on {{user}}’s face.