I don't ever remember making light of orphans, not to someone else, and especially not when I was 11/12. And don't blame all of humanity for one person's actions.
It's not making light of an orphan- it's simply stating a raw fact, without any tact or polished wording and she was trying to reason why Naruto kept picking fights with Sasuke-
- "so he doesn't have a normal childhood..."
It's an analysis of his situation that Naruto didn't have anyone to tell him right from the wrong and he pretty much could do anything he wanted. He had no parents to give him a scolding for that. She didn't even say that to mock him nor in front of him.
Sasuke got angry because he was dealing with loss of his own parents. The idea that he was now free to do anything he wanted would be applicable on him too and under circumstances it was annoying for him. His reaction wasn't exactly on Naruto's account but himself too. The "well meaning" but badly put in words - goes in line with well meaning but annoying girl.
It's something people say routinely- " he has no father/parents/mother so he didn't learn XYZ", kind of thing,"he/she is too indisciplined and does whatever s/he wants for there is no one at home to make them take responsibility for it or to punish.
I really don't care about such dialogues unless they are being idiot enough to say that to the person's face or being rude and offensive. I care even less about the people who use all kinds of nasty wording for a character or another person and then act as if they have some higher personal standards. Not directed to you- I am stating my opinion about people who behave that way.
About your second para-. Sarada is doing whatever she wants because she doesn't care what Sakura may think or do about it at this point. It's exactly like Sakura wanting to go after Sasuke leaving the village without thinking what her parents would thing about it.
In Sakura's case at least she was independent to an extent being a nin and doing missions independent of her parents. In Sarada's case she has been protected enough to think she could just go out and find Sasuke or the girl in glasses just like that. If Naruto didn't care enough to stop and go back what would she do?
What is the reason you like her?
Probably the fact that she left her unconscious without a worry about her health to find Sasuke who hasn't been around in last ten years. Though that maybe the reason for some others to think she is like Sakura, going after a guy who never showed himself in last ten years for whatever reasons.