I'm assuming this is related to my post comparing Pete dropping Khun when he's addressing Vegas in Ep 14 to Porsche using Ai' when he's addressing Kinn in Ep 9. Full disclosure, my knowledge of Thai is extremely limited and mostly confined to what I've learned from Perth Nakhun (Ken in KP) on his Youtube channel, plus a couple of websites with advice for travelers. That being said:
The Ai' particle before someone's name is a type of address (like P') that's very informal and only used between very close friends, otherwise it's considered rude, derogatory, even confrontational. Like, there's a difference between when you call your BFF a shithead while you're out drinking together and when you call your boss a shithead at the office. Ai' doesn't mean "shithead," but that's the level of difference you're looking at when you use it with close friends vs. anyone else, from what I understand. The thing is, Porsche also constantly uses the very informal pronouns guu (I) and meung (you), which are also incredibly disrespectful and offensive unless, again, you're speaking to a very close friend. Like, potentially fistfight levels of disrespectful. (Pete, by contrast, clearly refers to himself as pom for "I" in the Ep 14 scene when he's speaking to Korn shortly after he noticeably does NOT use khun to address Vegas - "pom" is formal, respectful, polite and a little bit old-fashioned, which means it only points up his earlier lack of "khun." I found it interesting that Chay also uses "pom" for "I" with Kim, while using "phi" for "you" - at least during their argument at the bar - so there's a definite contrast the show sets up between brothers, using language.)
Porsche absolutely shouldn't be speaking to his boss in this way - he really shouldn't be speaking to anyone we see on the show other than Jom or Tem this way. The fact that he calls Kinn Ai'Kinn is a sign of either extreme rudeness or extreme intimacy - those are the only two choices - and while no one would be surprised at Porsche being extremely rude, given actual precedent, the tone in which he says "Ai'Kinn" is clearly NOT being rude, and Kinn noticeably doesn't take any offense from it. That Porsche does this in front of Big and Ken tells them ... pretty much everything about Kinn's and Porsche's relationship there is to know.