She is annoying but MC isn't any better... if you search "whiney bitch" on Merriam-Webster it has a pic of him...
Oh I don't doubt it, MC does seem to be fairly whiney in his inner monologue, but I'd say that being whiney is a lot easier to manage than someone basically basing your entire worth as a romantic partner on what job you have. A few of my real life friends have had partners like her before and straight up none of those relationships ended up working out.
I guess I am a bit biased against people like her due to that aswell, but I just don't like that mentality, always been a proponent of 'if you're in a relationship, you put 110% towards your partner' type deal.
EDIT- Since I just got to the hotel part, can't say MC's sister is much better either. Basically fucking catfished him to a dying business when he really needed a job and an income. Yikes.
What's with devs nowadays and just writing irredeemable characters? What in the fuck. Atleast the MC is realistic in his reaction to it and not the usual "oops heehee you did a boo-boo but I forgive you

" like most devs tend to do with MC's.