Have enjoyed eating at Stone Park perhaps a dozen times since they opened, but have been party to the previously-described attitude of the co-owners there on more than one occasion. Last evening, had some visitors from out-of-town and decided to walk down Fifth Ave. without reservations. Peered into window of Stone Park, seeing several open tables. Asked hostess if we could be seated without reservations, co-owner, seated four feet away, didn't even give her a chance to reply, turned around and said "we're fully booked." I pointed out open tables, perhaps as a prelude to acknowledging we might need to give up table earlier than we might otherwise like. He did his non-verbal thing and she said we might like to come back after 9 PM.
This issue has been mentioned here by others on more than one occasion. I'll simply vote with my feet and take my business elsewhere in the future.