A comparison to Malia or Michelle is just silly. Malia is an actual child and has no power in her father's administration, and while I'm sure the President has on occasion asked Michelle's advice, she isn't an active player in his administration (not that people still don't have issue with her "controversial" goal of getting children to eat healthier, but still). Ivanka Trump, on the other hand, is a very closer advisor to her father. When he announced a child-care policy earlier this year, it was widely-reported by the campaign that it came about because Ivanka pushed him on it. Not to mention, she is also on the Transition Team and has sat in on meetings with heads of state- of course, she's also managing Trump's "blind trust", but who really cares about myriad conflicts of interest, am I right? Too bad we never got to see his tax returns!
If you think what this passenger did was questionable, that's your right, though it should be noted that witnesses didn't describe him as shouting or being intimidating. But here's the thing- Ivanka Trump has made herself a prominent political figure with the ear of the man who's about to be President. If she doesn't want to be confronted about that (and, given how she hilariously ran away from a Cosmo interview when they pressed her on the inadequacies of the child-care plan, it seems like she does not respond well to it), then she shouldn't be working for her father's administration. As numerous right-wing commenters have repeated ad nauseum in the past two months- suck it up, buttercup.
I am a firm believer in serendipity- all the random pieces coming together in one wonderful moment, when suddenly you see what their purpose was all along.