I don't follow you. My interpretation was that OP said roughly, "I don't understand/approve of GDPR because of this and this." Child then responded by saying roughly, "but America does it too." Seems like the child was trying to imply that OP's claims/concerns are false because they are hypocritical.
I think that child was saying that since America does that routinelly, Europe is entitled to do it too. Alternatively, may do it for strategical power reasons.