Yes, there are lots of men who love cats (the author is one), but the old stereotypes and prejudices—dogs are the proper pets for “real men,” and so on—linger. Thus, while you will see lots of men at dog shows, it is evident that there are far fewer men than women at cat shows.
This is changing as more men “out” themselves as cat fanciers, but part of the prejudice against cat shows (which the author fully understands) is the feeling of many men that cats ought to be kept and enjoyed but not necessarily fussed over and entered in competitions.