This is common on car warranties, well, the free maintenance that some dealerships offer. It's only good as long as they are the only ones doing. The reason being is because if an issue occurs, they are responsible for it. If that problem is because someone else didn't properly do something, they don't want to be responsible for that.
An example here is a dealership here in Oklahoma that offers a lifetime engine replacement warranty, but all maintenance has to be done by them and at the manufacturer suggested intervals. For obvious reasons. Should you decide to go to do it yourself, or some 30 minute lube, or pass the interval, you void it.
Now, I don't know about the specific warranty you're speaking of, I didn't have that, but saying the other person is being ridiculous is far from accurate. They may not be right, but did you not discuss this warranty as you understood it and ask why they either didn't seem aware of it or why they were refusing it? Is this the same dealership you purchased it from? If so, did you speak with your salesperson and broach this topic with them? And, if you're still running into walls, read and know your paperwork, then bring it in and point out what it says and how you understand it. If you still aren't satisfied, take it to Kawasaki.
All we can offer is our opinions and thoughts on this matter as we understand it with the information given. Don't be upset because you don't agree with it. Simply show the facts that weren't originally included, keep it constructive.
Sent from my ONEPLUS A6013 using Tapatalk