The irony of “Kidding” is that Jim Carrey’s Mr. Pickles isn’t. In Showtime’s half-hour comedy, premiering Sunday, Sept. 9, Jeff Pickles is too sincere for sarcasm. The host of public TV’s “Mr. Pickles’ Puppet Time” is so wholesome he makes Mr. Rogers look like a gangster. Mr. Pickles can be as downright cloying as spoonfuls of sugar. So to make …Continue readingJim Carrey’s ‘Kidding’ returns comic to TV as strangely sweet children’s host