I strongly agree with Liz. It is dangerous to draw the conclusions you have from a facial expression that may or may not have had anything to do with you.
In the outfits presented in the pics here, I only take issue with #1, and that is primarily because the leggings do not look like leggings to me. They look like tights. I am sure there is only a very slight difference between the fabric in #1 and #2, but visually it makes all the difference in the world.
As for the double standard with a long top/tunic and a skirt, Day Vies is correct, at least in my mind. Not to open up another can of worms, but this is my issue with skirted leggings much (but not all) of the time. The PERCEPTION of the third piece - the skirt - changes the outfit in so many ways. Skirts can be too short, regardless of what is worn under them, and even with the same leg/bum coverage, they can take an outfit from slouchy-casual (the leggings with a longer top) to flirty-sexy in the blink of an eye.
Other people may or may not agree with me, and that's fine. We don't all see things the same way. But IMO, shorter skirts will always get a side-eye from many people while a top with leggings won't. It may not be logical in terms of coverage, but it is the difference in how the outfits are perceived for many people.