The phrase "to fit that category" means that something or someone meets the requirements or characteristics associated with a specific group or description. Full definition
If you don't fit the category of sugar babe or sugar daddy, I suggest looking to other more general dating sites. (datingwise.com)
The twist this year is there are multiple players who fit each category and none of them may wind up being the two - time defending award winner. (sbnation.com)
This is because he does not quite fit the categories we ordinarily use in mapping out the intellectual universe. (firstthings.com)