The exact opposite of a hipster.
(Not to be confused with an anti-hipster)
While a hipster tries really hard to be different to create their own identity (just like every other hipster, creating a paradox of sorts) and set trends, a reverse hipster will try really hard to act like everyone else to fit in and be popular (even if they don't agree with the thing they are liking), and overcompensates by despising anybody who disagrees with the group.
Generally caused by viral videos or memes on youtube like nyan cat, vloggers (like raywilliamjohnson) and games like roblox and the more recent Call of Duty titles and musicians like Justin Bieber and Rebecca Black and any other popular topic on the internet.
A reverse hipster can either like or hate a topic, but it's always based on what a large group of people thinks, and always takes it too far.
Person A: Hey, did you hear Justin Bieber's new album? I liked it.
Reverse Hipster: Fuck no! Everybody hates him and you suck for liking him retard!
Person A: Hey, should I buy the new Call of Duty game that came out yesterday?
Reverse Hipster: How the fuck could you ask that? C.O.D. (pronounced "cod" like the fish) is the best fucking game ever! I play it every day for 12 hours! It's waaaaay better than (insert other popular first person shooter video game here) which sucks ass! Just like the people who play it!