Can 勝手に決める by itself carry a negative connotation?


As in, to add a selfish and careless tinge to 決める? Here, for instance:

> 「ふうん。勝手に決めて、わたしに負けるのもイヤ？」

Implying that such action (without taking any other context into
consideration) would lead the other party to lose to the speaker?

Thank you.




Depending on the situation yes, it can carry a negative connotation. It is
especially easy to see this situation in school and love-related dramas where
people are trying to make plans and there is a quarrel or disagreement over
something and one of the parties gives up trying to give input.

> Aさん： じゃあ、どうする？  
>  Bさん： そうだね．．．  
>  Aさん： どこのレストラン行く？イタリアン？フレンチ？  
>  Bさん： ちょっと洋食は今食べる気じゃないなぁ～  
>  Aさん： じゃあ、中華料理は？  
>  Bさん： それも別に食べる気分じゃないな～  
>  Aさん： もういいよ、 **勝手に決めて** <--- Is now angry/fed up




Depending on the situation yes, it can carry a negative connotation. It is
especially easy to see this situation in school and love-related dramas where
people are trying to make plans and there is a quarrel or disagreement over
something and one of the parties gives up trying to give input.

> Aさん： じゃあ、どうする？  
>  Bさん： そうだね．．．  
>  Aさん： どこのレストラン行く？イタリアン？フレンチ？  
>  Bさん： ちょっと洋食は今食べる気じゃないなぁ～  
>  Aさん： じゃあ、中華料理は？  
>  Bさん： それも別に食べる気分じゃないな～  
>  Aさん： もういいよ、 **勝手に決めて** <--- Is now angry/fed up

