Just a playful way to mess with people. At work, I see a guy that wears a D-Va shirt every other day. He is a big guy, and the whole D-Va thing is printed full-screen on his shirt. It makes quite a funny sight.

4chan people are notorious for pulling that kind of shit. I wouldn't be surprised if the person that makes that video is from /g/.

If you don't find it funny, then you don't find it funny, like how you don't get some movies or memes that people like. I do.