Razer actually swears far less than Hal and Kilowog, preferring to just make snippy remarks instead. Hal's a bit confused by this; he thought he was a bad influence when it came to cussing, because the Flash picked up on it from him back home.
I always saw Razer as the most sophisticated guy of the group, he probably sees no point is swearing! But what if Aya starts picking up swears from Hal! D: