It sounds like you still have the User - JomSocial plugin enabled. You'd want to disable that. I'd recommend going to the Plugin Manager in Joomla and searching for "jom" or "community" and disable any plugins that are specific to JomSocial. That should help clear up other issues you may run into if plugins for JomSocial are enabled while the component itself is uninstalled.
I hope that helps, but if there's anything else we can help with, just let us know!
Thanks,
Alex