No one has ever argued that it can't be done. The point is that it can't happen without the owner noticing. It takes force. Significant force. Especially when your supposed fulcrum is your spongy leg. If you apply enough force there to bend your phone you're going to notice that.
Listen, if anyone wants to give me an iPhone 6 that I can destroy, I'll show you how I can use my leg to bend the iPhone 6 substantially.
Even though my leg has skin, tissue and muscle, it compresses and at a certain point, it's hard enough to bend something without it HURTING ME.
Ever take a stick and break it over your thigh? Did that hurt? Did the stick dig all the way down to your bone? Of course not.
Again. Let me have an iPhone that I can break and I'll post a video of it on here and prove to you people that an iPhone can bend in your pocket if it's tightened against your leg when sitting down.
I don't wear tight pants either, but when I lift my legs up, the pants tend to tighten around my thighs. I think this happens to everyone. When there's something in my pocket, the pants tend to get even tighter.
Here's a video of how a leg can cause pressure on this phone https://www.youtube.com/watch?v=XQxX_x3HTXQ