Vim formatoptions-=or

If you found that the flag o is being inserted back in formatoptions after startup, you should find out why this is happening and fix it. This seems cleaner than always executing an autocmd, even after the option is removed.

You could check where the option is set issuing with following commands:

:5verbose set fo?
:5verbose setl fo?

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Edit:

If your problem is with a ftplugin file that lies on Vim directory ($VIMRUNTIME/ftplugin) you shouldn't change that file, because that change would be undone when Vim is updated. The proper way to change it is in your after directory, as explained in :h after-directory.

Supposing that the problem occurs with c filetype, create file ~/.vim/after/ftplugin/c.vim containing your setlocal formatoptions-= commands.

@mm2703 's solution didn't work for me, especially for java files, but this change did. I also wrapped it in an augroup, statement so resourcing .vimrc won't re-register the autocmd:

augroup Format-Options
    autocmd!
    autocmd BufEnter * setlocal formatoptions-=c formatoptions-=r formatoptions-=o

    " This can be done as well instead of the previous line, for setting formatoptions as you choose:
    autocmd BufEnter * setlocal formatoptions=crqn2l1j
augroup END

If your 'formatoptions' contains options in different order, like ro, then -=or won't work. Try

set formatoptions-=o
set formatoptions-=r

From help remove-option-flags:

Note that you should add or remove one flag at a time. If 'guioptions' has the value "ab", using "set guioptions-=ba" won't work, because the string "ba" doesn't appear.