Bear Grylls is a douchebag. He is only a showman without any real survival skills. He just puts out so much dangerous misinformation that will only get you killed in a real-life emergency situation. Drinking own piss, drinking liquid from elephant poo, climbing a tree... WTF? He fully deserves the ridicule he receives with the drink own piss meme.
I think the only people who like him are those who don't know much about survival and bushcraft. Once you know a thing or two about those subjects, you'll realize that he is an idiot.
If you want to learn survival skills, listen to Ray Mears or Dave Canterbury.