SOURCE (Oxford Learner's Dictionary – see entry 3)
To read:
[intransitive, transitive] (not used in the progressive tenses) to
discover or find out about somebody/something by readingread about/of something I read about the accident in the local paper.
read that… I read that he had resigned.
read something Don't believe everything you read in the papers.
So, we are not allowed to use progressive tenses with "read about / of".
However, this native conversation says "I'm reading about proper etiquette while I'm there."
So, is that saying "I am reading about…" wrong?
Note: no other senses of "read" have "to read about". We only have "to read about" in that sense (to discover or find out about somebody/something by reading)
Best Answer
The sense you are thinking of, "to learn (for the first time) by reading", certainly exists; OED:
I agree with you and the above commenters that this sense must be perfective, not progressive.
However, there is another sense in which you can say "read about", as noted in the comments, where "to read about X" means "to read (something) on the subject of X".
I don't think it would be considered a phrasal verb. Rather, we begin with a general intransitive "read":
This is then followed by the common preposition "about" as in "on the subject of".
Since this collocation is arguably not a fixed unit, it's somewhat hard to find direct reference to it in dictionaries, but we can spot it everywhere. This Collins entry could apply:
Similarly, this Free Dictionary definition is in the right direction:
The two examples given are of different senses, unfortunately; the first is your original, and the second is very likely this other sense:
We can also find a nice, clear reference to the extremely similar phrase "read up on/about" in the Cambridge dictionary, although they do call it a phrasal verb because they include "up":
But as the users in this other ELL thread write, the two phrases work perfectly well without that "up" (at least they do in AmE):
The use of "a lot" there is an excellent clue that it can't be the "learn about for the first time" sense.
Here's the phrase in action in a Toronto Star headline:
Note that you don't read about "friendships like these" as if they were news items, but as themes of novels.
For me, this is satisfactory to show that this sense exists. Now, if the intransitive verb "read" can be progressive ("Don't bother me! I'm reading"), then this collocation can also be progressive.
This Ngram shows that "reading about" exists and is at a sizable ratio compared to the standard form "read about". (Admittedly the gerundive form is included in there too, but I can't imagine that would affect the numbers too much.)
Finally, there's the conversation you cited:
To "read about etiquette" in your original sense would suggest that the speaker never knew that there was such a thing as etiquette in Sauda Arabia. But that would be quite surprising. Instead, she's boning up on the subject to round out her knowledge and avoid making faux pas.
P.S. I will say, though, that the sentence is very slightly awkward because "while I'm there" is phrased as though it would modify "I'm reading about", but it evidently can't because she's reading it right now according to the conversation and she's going next week. Instead, it modifies "etiquette" in a somewhat colloquial way: it's elliptical for "I'm reading about the proper etiquette [to employ] while I'm there". In any case, the awkwardness has nothing to do with "reading about".