Just because you set your name to regular doesn’t mean you will be shown as a regular user. Only regulars have the word “Regular” just off to the right of their username in the forums. It might confuse people for a second, but the lack of the “Regular” tag and missing Regular badge should easily prevent people from being tricked (with the possible exception of new users).
The only real way to tell is if it’s by someone’s name in a forum post. See to the right of my, @vtipoman, @Arkive86’s names in this thread for instance.
Honestly it doesn’t matter, it’s a title with 0 benefits. most people wont check profiles, and even when they do the badge will say otherwise. it just makes you look a fool.