I think it's a very poor article by a very self indulgent woman, and/or written to be controversial. (Samantha Brick style).
Of course, parents should put their children first and ahead of their friends. It's only natural, esecially when they are young and dependent.
I say that as someone who can't have children.
Yes, it sucks but you have to make your peace with it or you'll end up in a spiral of bitter negativity & end up writing articles like that.
Her examples, if true, are nothing to with parenthood and more to do with bad manners.
Most childless people, or certainly the ones I know, don't think like that.