This is such a funny and wholesome interaction that I really wish we could see more of. Knowing TXT this is completely on brand for them, they ask everyone this. Additionally, they're always going out their way to make their underclassmen feel comfortable and they're not too strict when it comes to heirarchy. Depending on the idol this could've easily been a terrible experience because of a simple misunderstanding. It likely wouldn't have gotten resolved either due to how rigid some people are about seniority but Im glad that wasn't the case!