The Mets’ opponents aren’t the ones beating up on the lackluster team.

Morose Mets’ fan Anthony Weiner threw a bean ball at the Amazins’ during a Queens mayoral forum this morning.

“I’m a pro-development Democrat. I think we should build and grow the city as we go and I want to do it smartly,” the ex-Queens congressman said when the topic of sports came up at the Terrace on the Park event.

“I would love to have major league soccer here in Queens. Heck, I’d love to have major league baseball here in Queens first…” Weiner said to guffaws.

Ouch.

He added with a chuckle, “I’m a Mets fan. I can say it.”