hii, first of all thanks for your interest! it means a lot 🥰
now, sorry but i'm gonna confirm what jk said lol and it's all due to tae's upbringing; he's filthy rich and acts accordingly:
-it is mentioned in ch 1 that he used to laugh at jk's siblings joke about jimin; that jimin is jk's "poor friend", and he never had the intention to meet jimin even though he knew jimin was someone important to jk. also in the same ch, when tae finds out jimin worked waiting tables in the charity events and birthday dinners, he was worried that he might have been mean to jimin and maybe that was why jimim was so cold to him, and if he was worried about that then he's definitely been mean to some waiters and staff in the past, also he says he doesn't even look at those people 🥴
-he's also lazy and he's used to getting away with everything since his assistant yoongi always cleans his mess. but tae's been forced, in a way, to be like this bc his dad thinks namjoon is the only one with brains and always reminds tae that he will never be as good as nj... which is why tae is jealous of nj. so he gives up easily and doesn't make an effort.
-now that i've mentioned yg i have to mention hobi, and also note that both are very loyal to tae, but obviously he pays them a lot since they see a lot of stuff they have to keep a secret. and later i mention that jk is the only one who knows about tae's sexual orientation but definitely yg and hobi know as well. but it's not the same bc it's not like tae came out to them lol they just see stuff (drugs related and sex partners related) and have to be discreet about it and they gather that THAT'S the real reason for the insane amount of money tae pays them.

but there are struggles despite his privilege and entitlement, and i feel like these might not fully answer your question about his personality but are informative nonetheless:
-idk if you read IFTPWIWY before reading LC but there's a paragraph about tae's internalized homophobia and how after being with jimin he changed, and in LC jk is the only one (in his privileged circle) who knows about tae's sexual orientation and tae still avoids talking about it with jk to the point that jk was under the impression it was just a sort of fetish thing; having sex with escorts or guys who did it for money and then go back to a nice rich girl that his parents approve of.
-he's a drug addict and he's been to rehab a few times (mentioned in ch 3, and eventually it will be mentioned at which age he started and other details).
-his relationship with his family is a mess (how he felt about his parents growing up is mentioned in ch 2, and so far it's been kinda vague he he doesn't get along with his older brother namjon, and eventually you'll know about his sisters too) but despite the mess he's used to having to act like a perfect family when they throw those charity balls and in front of other rich families and connections such as jk's family (also a mess and they all bullied jk growing up).

-also, his current obsessive behavior when it comes to jimin is very telling of his behavior in general and before jimin 👀 he acts like he has to have what he wants...
but yea, being so pathetic and trying to please jimin all the time is definitely something new hehe😬

thanks for reading my work and for interacting 💐 i'm glad you enjoyed that side of jimin in the new chapter