Too often we make assumptions about what people can/cannot do and what they might know. I’ve experienced this when visiting bike shops. All too often the male sales assistant will patronise me and assume that I know nothing about bikes. I might not be an expert, but you can guarantee that I’ll have read up on what I want.
Some great advice that I was given was to assume that someone knows an average amount and then ask a few questions to see whether you need to pitch your discussion higher or lower.