Jordany Valdespin went down fighting. According to a Mets source, the volatile utilityman, upon learning he had been demoted to Triple-A Las Vegas on Saturday, got into a confrontation with Terry Collins, during which he called the manager a “c--ksucker.” The source said Valdespin, in the course of his heated exchange with Collins, also tried to invent an injury and demanded to be placed on the disabled list. By the time the clubhouse opened to reporters in the aftermath of the Mets’ 4-2 loss to the Pirates, the 25-year-old Valdespin had regained composure, but had tears in his eyes. It’s hardly the first time Valdespin has been involved in controversy during his brief career. The most recent incident occurred in May, when he showboated after hitting a home run in a game against the Pirates in which the Mets were getting buried. The next day, Valdespin was sent to the plate as a pinch-hitter and got drilled in apparent retaliation. Last year, Valdespin angered teammates by wearing a white T-shirt on the team bus, in violation of the dress code. Valdespin later returned to his locker to find the words “El Hombre” written on the shirt, which was mangled.