Answer : Clearing up a stereotype, Interior Design is not exclusive to females. In fact, the interior design industry is stereotypically dominated by men in commercial and retail designing since this side of the business requires heavy engineering work like plumbing and electrical assembling whereas women are usually more fit for residential designing. As such, males have a better chance at breaking into this monopoly through these avenues.
In any case, whether you're working with residential or commercial spaces, people often find it hard to distinguish between an interior designer and an architect (except that architects tend to belong to ARB).