The indefinite pronoun 'everyone' is a singular pronoun. Everyone who is coming will receive a gift. The indefinite pronoun 'everyone' is a singular pronoun that takes a singular verb.examples:
Are the words everyone and everybody singular or plural? Should it be everyone's, everyones' or everyones? Joe got everyone's attention and started to speak.
The possessive of everyone is everyone's, in the same way the possessive of everybody is everybody's. May i have everyone's attention,. The possessive form is everyone's (the form everyones' is incorrect).example: In fact, to catch someone's eye is an idiom, not eyes. the question is not about everyone being singular or plural.
There are actually two issues concerning this topic: There is a comprehensive article on the topic on grammar girl: Your deduction, that not everybody's cup of tea means not to everyone's liking, is absolutely correct. The expression commonly used in both the affirmative and negative.
In my experience, the spelling checkers get confused by contractions. Would the noun following everyone's be plural? Unless of course you’re a buddhist or a cat, in which case everyone has multiple lives and both would be correct, depending on context. An example would be it flew over everyone's heads, or it flew over everyone's head.