Have you gotten a bible and *showed* them where it shows that the jews are rejected by Christ, called a synagogue of Satan, and that Christians are grafted on in their place? Or are they the types who think St. Paul was somehow a subversive who created his own brand of Christianity, because at that point they arent even worth arguing with, theyre too far gone. Either way, politely accept their apology, but if theyve shown no intention of actually seeking the truth, dont bring it up again unless they ask and show signs of being truly interested to hear you out. You are obligated to correct those in error, but only so long as they are willing to accept correction (and obviously within your station, I cant go up and beat the Pope because he says something I think is heretical, which occurs quite frequently, but I can politely point it out as I would my own father, who, coincidentally, is an unrepentant heretic.)