I guess meeting 3 out of 4 is not bad, but . . .
My high school was a mix of about 25% Irish, 25% Italian, 25% Jewish and 25% WASP. In general, everyone got along pretty well most of the time, but when things went south, you could almost guarantee that ethnic prejudice would come out and it could be pretty mean. So, even within a seemingly homogenous group, varying ethnicities were still a prejudicial factor.