'Everybody' is an indefinite pronoun (words which replace nouns without specifying which noun they replace) that requires the use of a singular verb. That's the reason it's correct to say "Everybody hates
Chris" (hates = verb).
Examples of this kind of indefinite pronouns which should be followed by singular verbs are: another, anybody, anyone, anything, each, either, everybody, everyone, everything, little, much, neither, nobody, no one, nothing, one, other, somebody, someone, something.
However, there are other indefinite pronouns that take plural verbs: both, few, many, others, several:
of us were invited to John's party. Several
of the documents were
filled with errors.
Further, there's a third kind of indefinite pronoun that can be followed either by a singular verb or a plural verb: all, any, more, most, none, some. (It will depend on what the indefinite pronoun refers to)
All of the people clapped their hands.
(All refers to people, which is plural.)
All of the newspaper was soaked.
(Here all refers to newspaper, which is singular.)
More information about indefinite pronouns can be found on the following websites.
Sources: http://www.grammaruntied.com/blog/?p=319 http://www.k12reader.com/indefinite-pronouns/ http://englishplus.com/grammar/00000027.htm