Reading to children in libraries is so that the kids can be exposed to different people/lifestyles and hopefully will understand that while we all may look different, inside we’re all the same. Ideally this teaches them empathy and acceptance.
But I think this in lies the question:
From what we have been hearing is that "Drag" is an "art form," "way of expression" and above all used as "entertainment"
I may be wrong, but the outfits, make-up, wigs, and overall flamboyance of "the art" is not something that DQ's do to make a run to the grocery store. It is for drag shows and other theatrical focused events. Most DQ's dont live 24/7 drag.
If this "costume" is only for the shows and "entertainment" held at adult focused venues, why would an average 4-6 year old need to be "exposed" and/or "understand" the lifestyle at this age? Why are we not saving this topic for when they are old enough to actually go to the clubs?
Then you have crossdressers who would live or go out in the opposite clothing then their natural gender. CDs are generally less flamboyant and often times can pass for whatever gender they are expressing, basically flying under the radar. A 4-6 year old wouldn't give them a second look let alone think anything about emulating them.
Edit to add: I just did a quick search for "Drag Shows NYC Age requirement" and all of the top hits are a min16 years old or older.
http://www.nycdragshow.com/read-me
18+
21+
18+
2nd edit: man, my search history is bonkers right now...sorry google. If I start getting display ads for drag shows, there is gonna need to be some explaining to do