because when I was a kid, I was the late reader who worried everyone until 3rd grade when I finally really got it, when my DD was pointing to things and reading them loudly in public when she was little, I just used to laugh and say "she didn't get it from me!"

You could always shrug and raise your eyebrows like or "oh well!" or something to the effect that it's just everyday life for you.

Does that help? As you said it's an awkward time so it will pass, but it's also a fun cute time.