There appeared to be no love for New Jersey on Wednesday when “Seinfeld” star Jason Alexander performed with the Boston Pops on its opening night. When Alexander mentioned that he was from New Jersey, there was just a smattering of applause in Symphony Hall. “Really? Jersey? I guess Boston Strong, New Jersey . . . adequate.” He attempted to make up for the lack of Jersey love with what he called his inappropriate medley: a string of Broadway songs, deemed not appropriate for him to sing. He offered snippets from “Phantom of the Opera,” “Les Miserables,” “Evita,” “Oklahoma,” and, wait for it, “Tomorrow” from “Annie.”Christopher Muther can be reached at email@example.com. Follow him on Twitter @Chris_Muther.