people often say "You're weird" to whoever they think that didn't fit with their er...Ideal (i hope i choose the right word)

If we analyze from that simple sentence we could conclude that the one that gives out that statement is "normal". However, what is exactly normal? People that do usually routine over and over again? or a genius that hold back when answering question to let others have a chance? It didn't quite feel right.

Hmm...let's take out an example shall we; people who hate anime/manga tend to say that otaku is bunch of weirdo. On the contrary, the otaku will think the other party is weird, like they will think "how they don't know the grand of anime" etc. In this case, there is no "normal" person.

So what is the one that define normality?
Please give me your opinion about this matter and the reason