I use these 'labels' as descriptions, of my child or any child.
Not to put them down, but to describe what may be going on.
However, I do not use these terms "at" my children. Nor do I call them that to their face or when they are around or when acting up.
My son, was SO easy going up until 3-4 years old. He did not have ANY phases or terribleness. Then now at his age of 4.5... it seems like it all got rolled up into one, and he is making up for it. He... at this age, is really not easy sometimes. Really not easy.
My Daughter however, at each age juncture, went through all those so called 'phases' like clockwork. But not in a super terrible way. Just was more challenging. Than usual.
And to me, well some behavior is just that- terrible.
My kids are great. But they are not Angels. They, I know, can be pretty icky at times. ie: terrible.
But they are not terrible kids. They can just act that way at times. They are overall, really great.
Me, I am "terrible" too sometimes. I know it - how about when PMS'ing?
That is a label too.
For women. Said by women and about other women.
But I call myself that too. I am not a pleasant daisy when PMS'ing.
But my knowing that, does not 'make me' that way.
I do not think, that people necessarily become what we expect of them. In all cases.
UNLESS... it is something that is hammered into the person, constantly.
And sometimes, 'expectations' are simply not in line with a child's development... so it is the parent, who is letting down themselves, because they are expecting their 3 year old for example, to act like a 5 year old. It will never happen. But so they think their 3 year old is a 'bad' kid.... because their parental expectations, are inappropriate. And not age appropriate. It is too high. Per child' age development. So then, because of that, their child, DOES act up. Because he/she is frustrated and can never.... meet their parents expectations. I have seen, some parents like that. It is a disservice to a child- just like, expecting them to be 'terrible.' But... it is the parent's expectations... that are not appropriate to a child's development.