If you are a happy, nice person you are more likely to have more friends than an angry or sad person. Honey is sweet but vinegar is not.

The idiom 'You can catch more flies with honey than with vinegar' dates back to the 17th century and means that being kind and polite is more effective in getting what you want than being harsh or critical. The sweetness of honey attracts flies more effectively than the sourness of vinegar.

Because flys like Honey which is weet but they dont like vinegar

"Tart words make no friends" and "You catch more flies with honey than vinegar" are figures of speech. They imply that you will not make anybody like you by being short or rude. Kindness makes friends.

you can catch more flies with honey than vinegar