simonalkenmayer:

n. The habit of constantly belittling the accomplishments of others or to think them worthless or incapable.

Yes, it’s a real word. It began appearing in the 1700′s. Though it has been used in the contemporary, recently.

Example: I avoid him at parties because of his constant floccinaucinihilipilification of the staff and other guests. He could make a Nobel laureate feel like a child on a playground.