In Chinese culture, the concept of 热闹 (rènao), or a lively, bustling atmosphere, is often highly valued. A restaurant that is 火爆 is a very good thing. It signifies success, quality, and a desirable social energy. This contrasts with some Western preferences for quiet, exclusive, or calm environments. In China, a long line outside a milk tea shop or a noisy, packed restaurant is a strong signal that the place is worth visiting. The 火爆 status is a form of social proof. However, when applied to a person's character, 脾气火爆 (píqi huǒbào), it carries a negative connotation. It describes a lack of self-control and emotional regulation, which goes against the traditional Confucian values of moderation (中庸 - zhōngyōng), harmony, and emotional restraint. So, while a 火爆 business is a sign of success, a 火爆 person is often seen as difficult and immature.
火爆 (huǒbào) is an extremely common word used in everyday conversation, marketing, and media. Its meaning is heavily dependent on what it modifies.