Hello everyone! How are things today?
Our idiom for today is suit yourself.
This means to do exactly what you like without caring too much about others feelings.
It can have a negative connotation as shown in Example 2. Person B actually wanted Person A to go to the rugby game, but gave up and said "suit yourself". Please have a look below.
I recommend having the steak, but suit yourself.
A. I'd rather go to a museum than the rugby game.
B. Fine, suit yourself.