I think you can be more allergic to one cat in general than another, and of course you become desensitised through continual exposure (so you normally can live with your own quite happily). I'm fine with Suki, who's got very very very very very sleek fur mind you (she should do with the size of the food bill and amount of time she spends having a bath in my bed blocking my view of the telly), but when I go to my mum's house - the two boys there DO make me react slightly (not that I'd stop fussing of them mind you) - I did reject rehoming a long-hair when I originally got Suki though because of the allergy reason - figured I'd better not push my luck too far. My little brother, since he moved out to go to uni - struggles desperately with them because he lost the day-to-day exposure keeping his reactions in check, but since our family all have the view that you never ditch your family members however inconvenient they may become (this refers to cantankerous grandparents as well!) - and that goes for furry as well as fleshy, he just copes by lots of hand washing and keeping his bedroom as a completely cat free zone.
Perhaps the person in the OP reacted MORE because it was a new cat into the household than out-and-out gender issues?