By Bonnie Stiernberg Nathan Fielder’s new HBO show The Rehearsal, has earned a lot of buzz for its insanely ambitious concept — the show sees Fielder helping real-life people rehearse for big moments in their lives ahead of time with the assistance of paid actors and elaborate set pieces a la Charlie Kaufman’s Synecdoche, New York. It’s a funny, revealing show that revels in the awkwardness of everyday life, but after Vice published a piece this week in which a participant said he did “not enjoy his time on the show,” there’s been debate on social media over whether the series is exploitative….