No one can decide if they like or dislike dancing after one lesson. When I asked my husband to take lessons with me, I made him promise that he would stay with it for a year. After that if he decided it wasn't for him, he could quit but I would continue on my own. Six years later, we're still dancing together and he really enjoys it (much to his surprise!)
Personally, I would have been angry and disappointed if he had quit after one lesson.