Mary Poppins: Selfish Snob? The Truth Revealed!!(part one)

So, I was watching Mary Poppins yesterday and I came upon some disturbing conclusions as I picked apart the movie.
The first thing I realized is that Mary Poppins is very self-righteous. She comes into the Banks' house with the seeming knowledge that she would get the job no matter what. She's even a little arrogant about it. She even takes the liberty of saying she is going to try out the Banks' house, not the other way around, that the Banks' should be trying her out as a nanny.
Once she gets upstairs, her conceited spirit overflows as she proclaims herself "Practically Perfect in every way" while the children are labeled as sub-par and flawed, to their faces!!
As the room is then tidied, Mary Poppins takes the children to the park where Bert is doing chalk drawings. When he first meets her, it is obvious he has met her before and that he loves her. Although this love could be meant as a friendly love, I am almost positive it is more romantically inclined. Throughout the entire movie, she leads him on--smiling at him, singing with him, dancing with him--and yet never returns his affections. In fact, as Bert sings of why everyone should love Mary Poppins, she sings along! Now, to give her credit, she does sing a bit about Bert, despite that its all "Bert's a gentleman, he's nice, I have fun with you" unlike Bert's "When Mary holds your hand you feel so grand, no wonder that its Mary that we love." Obviously a difference.
This is the end of part one. I shall continue my rant about Mary Poppins' character flaws when I am less tired.