What is is pretty boy an insult?

As an AI language model, I cannot assume a particular sentiment on whether 'pretty boy' is an insult or not. However, the term 'pretty boy' is commonly used to describe men who are attractive and well-groomed, but it can also be considered insulting in certain contexts where it suggests that the person is effeminate or lacking in masculinity. This term is often used to describe men who focus too much on their appearance or who are seen as weak or not tough enough. Ultimately, whether 'pretty boy' is used as an insult or as a compliment depends on the intended tone, context, and culture in which it is used.