Do you believe in the saying "do for all or do for none"?

There was a video that I saw that went viral about a week ago involving a woman confronting her son's father for bringing McDonald's to their ONLY son that they have together and not for the rest of her children that she has by other different men and their son is the youngest and she admits that this isn't the only time that this has happened on multiple occasions and she was seen on the video arguing with him about it and she snatched the food from the man and threw it on the ground saying "he's not going to eat that in front of the other kids" even though that the man has stated multiple times in a video that his only responsibility is his only son that he has with her and has no obligation to her other children which I completely agree with.

She then made a follow-up video responding to the backlash explaining her reasoning for her actions and has admitted that when they were together, that he would provide food for their son and her other children but now that they are no longer together that he no longer provides for her children but their only son and that she stands on her argument whether anyone likes it or not.

In my opinion no one is obligated to do for any child that is not biologically their child. If they are not caring for them.

And there was some people in the comment section agreeing with the woman stating that she is right for her actions as she does not want to cause division amongst the children but that is not his problem.
Do you believe in the saying "do for all or do for none"?
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