Okay, I can't with the allarming amount of people who still don't understand the end of Mario Odyssey, like, it's not so hard to get.
Peach did not reject Mario (she didn't even shout "No!" She said "Enough!") Girl was mad at him because he was competing with Bowser, shoving flowers in her face, like she's some prize to win.
You can even see when she steps on the ship she lets out a sigh! That's disappointment and it's all for the moustachioed plumber.
Any true fan knows she is canonically head over heels for the man.
Sure, it's still a 'kick in the crotch' of an ending because Nintendo literally had them dress up for a wedding in the game AND sold us amiibos and plushies of, again; them dressed like groom & bride...
We were baited hard. That you should repeat over and over. Duh.