Just because someone dresses in short shorts, or tank tops, or crop tops, or anything else, it doesn't mean that they don't respect themselves. 
It means Oh hey this is comfortable for me, I am comfortable with my body so yeah I'm going to wear it. 
This whole idea of "oh you're wearing short shorts? honey learn some self respect" is complete bull freaking crap. 
Do you even know what self respect means? It means pride and confidence in oneself. And the last time I checked, that definition did no where include
"Not wearing short shorts, tanktops, or bikinis"
If you don't like it, then don't wear it and don't look at me.