I have noticed that when a user configures "Website Redirects" and then their account is disabled (Manually) that the AliasMatch line is added below any RedirectMatch lines that are used to redirect parts of the domain.
Instead the server should add the AliasMatch line that disables the Apache portion of the Virtual Host so that users get the disabled message instead of actually being redirected.
Example with 1 Website Redirect and account disabled:
RedirectMatch /(.)$ http://jsitconsulting.net AliasMatch ^/.$ /etc/webmin/virtual-server/disabledweb/13116484435940.html