Showering frequency is such a personal thing. There's a wide range of what would be considered hygienic and socially acceptable, and it really depends on one's individual skin type, sweating tendencies, fabric choices, etc. I think a lot of people would be shocked to find out how much or little a given stranger showers. If Mindy were really gross, that's one thing, but even then, it's best to tread lightly when commenting on the grossness of anyone you're not actively trying to burn a bridge with.
The travel clothes thing makes me feel like such an old throwback, but I do wish people would try just a tad harder to look decent while flying. It's really not hard to sub a more finished pair of Ponte leggings and a sweater-blazer for the thin leggings and hoodie, some cute flats for flip-flops, and a thin scarf to tie it all together -- and keep warm on the plane without having to use a pseudo-sanitized airline blanket! Honestly, how cute is this outfit? And none of it is uncomfortable, and you can wear a super soft drapey tee under the blazer and no one will know that it feels like pajamas.
So, if you see a lady in this exact outfit, wearing pink Beats, speed-walking through an airport with an energy drink in hand, and giving stank looks to the screaming children, go ahead and introduce yourself! I don't bite!