Looking at its mathematical definition as: MOST COMMON IDENTICAL FACTOR.
We can now see how it is incorrect to use the term normal as people as THROUGHOUT TIME AND SPACE THERE HAVE NEVER BEEN TWO PEOPLE COMPLETELY THE SAME. therefore THERE IS NO NORMAL
and by proxy there is no abnormal either
Joe: No one, because there is no such thing normal person. Were all different
Greb:(to normal person)Yeah, hes such an idiot, beating up that 2 year old!
Normal person:Lets go help!