It's hard for me to imagine a more Philistine sentiment than dismissing something as art on the grounds that, if a child can do it, it must not be art.
The only issues I have are the proponents of abstract art doing 2 things:
(1) Presenting abstract art as a worthier pursuit than illustration, as if somehow abstract art is harder or more unique than all other art forms.
You can feel the vibe from fine arts professors who look down on illustration majors.
(2) As a subject of study, it feels like they're not willing to learn techniques like perspective, anatomy, etc.
There is no progress on actual learning. I think if you want to be truly creative, you should be willing to learn techniques and then seeing how to break them, so that you KNOW why something feels like X.
Instead it feels like they "look down" on it without ever trying it.
I think people have connected the "we are superior" vibe with the lack of development of skills and started to feel what this connection is called: pretentiousness.
Unfortunately people have also connected the actual art styles to that and dislike the works just because of the art style as well.
Abstractions of what? Surely to have an abstraction, you have to have a subject. If I'm drawing lines randomly, I'm not rendering an abstraction of anything.
For example, see abstract expressionism.
Unless you want to argue that any output you produce represents the abstraction of your brain's state (ie the random lines represent the firing of the neuronal pathways that are causing you to choose that specific arrangement of "random" lines), but that's pretty meta and outside what I think the common conception of abstract art is.
Which is (unintentionally, I presume) a subtle form of putting words into my mouth and then arguing against those instead.
I’ve seen kids frustrated because their “abstract art” didn’t look realistic enough and wanted an older kid or person to help them “draw better”.