I find the hate against cargo shorts hilarious. They're pretty much all I wear in the summer. Granted, a lot of that is outdoorsy stuff, so the pockets actually come in handy. Wear what you want. I get not wanting to look like a slob, but the people who will instantly judge based on a particular type of clothing are people whose opinions I don't give a rip about.
On topic, I wear cargo shorts to the office on days it's over 80F with a nice fitted polo and I'd hazard a guess that that's less casual than about half the office (many do jeans and a t-shirt). Software company too if it matters.
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