Don't you hate him?
Foot in the door.
Never stops talking.
Won't leave you alone till you've bought some crap that you don't really want.
Is that what "sales" means to you?
Frankly, without sales, you haven't got a business.
But it doesn't mean you need to be an arsehole about it. You just need to think about it differently.
How can I get to an outcome that helps both me and my potential customer?