A mentch is a good and kind person who does the right thing.
Being called a mentch is a very good thing. It means you are a good person.
Examples:
He is a real mentch, always helping others.
She was a mentch and helped the old lady.
Being a mentch is important.
I want to be a mentch when I grow up.
He's such a mentch, he even helps animals.
She's a mentch, always doing the right thing.