It's wrong to be jealous.
John is at the bar when Bill shows him a photo of his hot new girlfriend.
John wants to give his opinion of the picture.
John tells his friend that she is very pretty, and he's proud of him for having the courage to ask her out.
John tells Bill that she's not that hot and looks kind of trashy in fact, and he shouldn't be so proud.
Bill is delighted that his friend is so supportive and so uplifting and has a big smile on his face.
Bill is angered that John would say that about her and is not happy that his friend is so callous.