Yes that's a hideous thing to say. It's good he was interested in understanding why really.
Reminds me of a waiter once who asked if I wanted coffee. I vacillated a little, 'no thanks, oh well ok, thanks' and got a 'witty' 'oh typical woman, they always say no when they mean yes, ha ha', addressed to my dining companion, my dad. Ugh.
Also of emails I received for a while from Virgin Wines, after I'd taken up one of those 'half price case, no obligation but we'd really like you to sign up to a case a month' offers. They were along the lines of 'i haven't heard from you for a while, I hope you haven't forgotten about me, how about x,y,z, from, some bloke'. Can't recall exactly. The tone just struck an immediate 'creepy, stalky bloke' chord with me. I responded to tell them this. Young marketing twit clearly did not give a damn or have any interest in trying to understand my pov, or learn why they might put off other women with this approach. I told them never to contact me again.
On a lighter note, I hit on my best 'win win' response to chuggers a few years ago, once when this answer was true (then realised it was a brilliant stock response); ' oh, I already support you', smile and walk. Cheery greeting back. All happy.
I used payroll giving at the time, which is much better, as there are no recruitment fees (chugger wages) to cover and it's pre-tax income, so no faffing about recovering gift aid either, just straight up full value income.