Totally agree. A lot of technical people miss this. Sales people often (but not always) do this because they don't understand the product - they tend not to have a deep technical background. They compensate by picking up the language - most sales people spend a lot of time in conversations with other customers, product managers and technical people where a range of words are used. It lets them pick up the words, and get a shallow understanding of the concepts.

So most commonly you should just assume the sales guy is confused rather than being a tricky genius!