Why do people love normal when it benefits them, but question or ignore it when it does not?

Normal, it is a word people slide around the table like a poker chip or a domino. If it helps them, normal is one of their best friends. When it does not bolster their cause, they say, “What is normal?” If one wants to use that fine of a brush, the only thing normal is the birds of the field, grass, rain etc. Are people so afraid of not being PC, or so afraid that admitting something is normal, that real fact will be offensive to someone. If there is no real normal, then one could argue that psychopaths are normal, they are just not prolific. You cannot say that “Little People” or not normal because they are shorter than the usual height most people born, because admitting that fact in the minds of many is somehow diminishing there people because they were born with a condition. What makes it so hard to accept normal, even if the normal points out something not to be normal? If you cannot have a base for normal, by default doesn’t that leave anything abnormal?