The difference between "eveyone" and "eveybody"

Hi, I'm Japanese. All the English-Japanese dictionaries I consulted say: "Everybody" is more casual than "everyone" and used more often in conversations than in writing."

But an American wrote: ”Everyone” and “everybody” is another pair of words, that are commonly confused by non-native and native speakers of English alike. “Everybody” is supposed to be used when referring to a group, creating a certain psychological distance, while “everyone” is usually used when talking about a group that you are more intimate with.

The definitions in the dictionaries seem to contradict the explanation given by an American. Please clear up my confusion. Thank you.

---

You dictionaries are correct. There is no significant difference between someone or somebody. The -one forms are generally used more when writing and the -body forms are more common in British English, when spoken.

My advice is that they can be used interchangeably but if someone asks you a question using the -one form, it is common to reply with the -one form.