No. People ask, “are tabby cats male?”. They should ask “are red tabby cats male?”. To which the answer is: there are more male red tabby cats than female tabbies.
To an informed cat owner or someone who knows cats the question in the title sounds a bit silly. But we must be sympathetic towards, and understanding of, people who really don’t know much about domestic cats.
It seems likely that some people are confusing red (or orange) tabbies with tabby cats in general.
Tabby cats in general are of both genders, equally. It is just red tabbies that are more likely to be males due the genetics behind the red coat. You can read about that here. Tabby cats can be purebred, pedigree cats and random bred cats. It is the most common coat for random bred cats.
Tabby cat coats come in a whole range of types of patterns and colours. You can read about that in some detail here. Red tabbies have a personality type, it is said: leadership qualities!
Hope this clarifies things.