“How bad of a day are you having if you are homophobic and a Patriots fan?” comedian John Mulaney asked the crowd at Comedy Central’s annual SummerStage show, “Stars Under the Stars,” on Wednesday. Fellow comic Amy Schumer, meanwhile, turned her attention to trashing women’s magazines, telling the crowd they just make women feel worse with their advice. “They give you tips like, ‘Be Asian,’ ” she joked. Frequent Friars Club roaster Jeff Ross offered an awkward moment when he invited two teens on stage to be “speed-roasted.” But Ross’ outrageous, racy jabs at the young folks’ expense caused several guests at an Empire Hotel after-party to wonder aloud, “Where were their parents?”