Maybe it's just me, but I think people are reading waaayy too much into this. It's another stupid t-shirt in the long line of stupid t-shirts in America. Do we really think a discerning parent who bought this gag gift for his daughter REALLY endorses the concept?
Anybody remember "I'm with Stupid" and "My Dad went to California and all I got was this stupid t-shirt" t-shirts?
I'm not short-selling the advertising/messaging that kids are exposed to and at young ages, but given that no 7-year-old is likely to buy the shirt for themselves, I gotta give the parents the "it's the end of the summer and I wanna buy my kid a silly t-shirt" benefit of the doubt.
Sincerely,
a dad of two daughters, both of whom are honor roll students and do math waay better than their numbers-challenged father.