The term 'miser' implies disapproval and portrays the person negatively. Don't be such a miser; it's your turn to buy us all coffee.
Pro Tip 2/3
Metaphorical Use
'Miser' is often used metaphorically to describe excessive frugality. Stop counting every penny—don't act the miser.
Pro Tip 3/3
Human Attribute
Being a miser is not only about money, but also about a reluctance to share and enjoy life. He could afford a better car, but his miserly ways kept him driving the old clunker.