You wouldn’t think there would be any competition in terms of hostile crowds for the Giants than the one they will face for four games this week at Dodger Stadium . That is, until they heard it from their own fans over the weekend at Oracle Park. “I had never heard that, ever,” outfielder Heliot Ramos said. Things have gotten so dire in San Francisco that a historically cordial home crowd voiced its frustrations at multiple points in the team’s ugliest loss in an eyesore of a season. “What would you do?” manager Tony Vitello said in reaction to the rarely heard boobirds. “I think it got to the point where it wasn’t an acceptable effort.” Heliot Ramos celebrates a solo home run. AP At the quarter mark of the season, there haven’t been enough acceptable efforts from a team that expected to compete for a playoff spot. Only thanks to a walkoff win in extra innings the following day did they begin Monday outside of the cellar in the NL West. Time is running out fast to turn things around.…