asshole

The 'Big Head, Little Body' meme stems from an actual bronze sculpture located in the Egmont Garden, created by Thomas Lerooy. It perfectly describes that one super annoying person in your life that just can't be wrong about anything. Oh, you have a degree in chemistry? Doesn't matter because he watched one chemistry-related YouTube video and now he knows more than you! 

These people are dickheads and assholes. You should not aspire to be them. 

However, you should sensibly chuckle or shake your head condescendingly at these idiots and their actions.