During the closing moments of a Dec. 15 game held at Upper Darby - a contest Lower Merion won handily - several parents said that they heard spectators chant, "Warm up the Ovens" and "We'll write letters to you at Auschwitz."Some Lower Merion students posted comments calling their rivals "white trash," and told the students to "talk to us when you're in our tax bracket." For their part, Strath Haven students allegedly posted messages referring to Lower Merion soccer players as "kikes," and threatened to "change the pipes in the showers so water doesn't flow through them, but gas does."While he noted that Lower Merion kids aren't blameless, "there's nothing funny about 'turning on the ovens.' You just can't say certain things."