Cinch lets you return it if you're not happy with it, no arguments. It's actually better - effectively you get as long a test drive as you like, with no risk.Every car I've ever bought has been on that basis, apart from a few 'classics' that weren't in a driveable condition.
I'm genuinely staggered though at the number of people who buy cars online from sites like Cinch without any test drive at all, just look at a few pictures, click a button and it's yours, seems weird to me.
I agree with many above though, the salesman has decided the OP is a time (and petrol) waster and would rather sell it to someone else. Someone fussy enough to need two test drives is probably going to be the customer who keeps coming back with stupid complaints.