I didn't see Wings3:16 claiming this image as his own, that he made it, or it was his original work. Following the link on both Reddit and Imgur there are no privacy claims or restrictions, usage rights, or copyright attached to this. The original poster of the work never requested credit for usage of this GIF.
Therefore, it's not stealing or theft when it is an image provided for public use with no restrictions attached to it. On top of that, it was built at GIFSoup which is basically a "Stick a head on this animation" kind of site and it likely took him all of 2 minutes to create. Point being, there is no problem here and declaring it "stealing" is incorrect.