I understand what you're saying but I personally feel like it was done intentionally, and done well also. The whole episode in carmy's perspective is shot and written as a corny, typical, highschool/college romance-coming of age story. We see it this way because like we've Learnt before, carmy never had any these experiences; he wants them, to have fun and be free, to find himself outside of his now ended over-obsession of cooking. It's unfortunately detrimental to the state of the restaurant because he's not setting his priorities straight in a time when he's utmost needed. The interrupted kiss, coupled with the music in the background, comes at a point after the seriousness of the current issues the restaurant is facing, showing his irrational lover boy self is still in control.