The grammar point Kuse Ni refers to the meaning of and yet; although; despite the fact that ~ This expression is similar to Kedo but expresses a stronger emotion by the person who i using it.
くせに is often used when we want to accuse, tease, criticize someone, it basically shows the speaker’s contempt or dissatisfaction towards somthing.
Formation:
noun + の( = no) ＋くせに( = kuseni)
ex: 彼は男のくせに甘いものが好きだ。= Kare wa otoko no kuse ni amaimono ga sukida.
= For a man, he likes sweets.
ex: 大きい会社のくせに設備が整っていない。= Ookii kaisha no kuse ni setubi ga totonotte inai.
= It is a big company but it is poorly equipped
ex: 医者でもないくせに。= Isha demo nai kuseni.
As if you were a doctor?
ex:
彼は、歌が下手なくせに歌手になりたい。
= Kare wa utaga hetana kuse ni kashu ni naritai.
= Despite being bad at singing, he wants to be a singer.