maintenance?!?
Introduce Yourself
Lots of people think that locks should look pristine and identical. That's not that case. Especially for natural ones. In fact, healthy locks need to have different shapes and sizes. There's no maintenance that they need other than washing and separating.
I ran into a similar situation a few weeks back. A girl I used to work with does hair styling on the side. She made a comment to me about how locks need no maintenance most of the time, but when they do, they need a lot. She though that once or twice a year locks needed to be cleaned up and have the roots tightened. I explained to her than any maintenance is damaging and that she shouldn't tell her clients that they needed to come back for "touch-ups". I hope it sank in. It seemed to. I think I'm one of the few people she knows with dreadlocks, let alone healthy ones. So I feel like it made a difference coming from me.
When you get into these situations, just be calm, and basic. Don't get preachy and don't go into any more detail than is absolutely necessary unless they ask more questions