Working on a membership site, we have to create multiple level of users. Usually we do not want the users to have access to the WP-Admin panel because it is not customized for their experience. Rather we have put everything necessary (such as edit profile page), user dashboard etc, on the front-end. For that reason we have to disable the WP Admin Bar for all except the administrators ( hidewpbar wordpress plugin).
The following plugin disables the wordpress admin bar for all users upon activation.
[ Download Hide WP Bar Plugin from Gitlab.com ]