Just because he’s received a supporting actor Emmy nomination for every season of “Mad Men,’’ that doesn’t mean John Slattery is blasé about the recognition. “If you start expecting this stuff, you’re crazy,’’ says the silver-haired actor who plays ad man Roger Sterling. “Really, it never gets old.’’ Slattery, who grew up in Newton, was on Fire Island with his wife and son when we reached him after the nominations were announced. “I’m usually shooting in the summer, but it’s all backward this year so we rented a place here for a few weeks.’’ He’ll be in Boston Sunday as part of the Red Sox Foundation’s annual Picnic in the Park fund-raiser, and he’s donated a choice item to the auction: A visit to the “Mad Men’’ set in LA. (Can’t make it to the picnic this weekend? You can bid online at www.redsox.com/picnic.) Slattery, who heard about Picnic in the Park from actor Mike O’Malley, is a serious Sox fan. His uncle, Jack Rogers, was the team’s traveling secretary for many years. “I was at the ’75 World Series, I was at the Bucky Dent game, I was at the [Bill] Buckner game at Shea Stadium,’’ he said. “I watched the 2004 World Series through the holes in my hat.’’ Asked what we should expect on the new season of “Mad Men,’’ Slattery was tight-lipped. “I don’t know, and I wouldn’t tell you even if I did,’’ he said. The actor told us he’s been busy while waiting for the “Mad Men’’ writers to finish their work. He made a movie called “Return,’’ which screened at Cannes, and another, “Family Tree,’’ costarring Gabrielle Union and Jena Malone. “I guess that the disadvantage of doing something like [“Mad Men’’] is you could get typecast,’’ he said. “But that hasn’t happened.’’
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