Oh my! What a ridiculous thing to say.
But, I can share that this exact thing happened to me once. I was at a conference a long while back and somehow we got onto the topic of conversation of circumcision. One of the older women there said..."oh, it's so much better that they do that because I knew a man who was uncircumcised and he smelled so bad." The way she said it though, made my blood boil (absolutely no circumcision in our family--even my father who was from Europe was shocked that people here did that). I immediately shot back some comments at her that it was just that man who smelled, that nobody in my family was done and they were completely normal. I must have had a look on my face that made her stop dead in her tracks because she basically stuttered and changed the conversation.
And, I'm easy going about all sorts of things. But, this made me SO mad.
And, don't be surprised if someday your daughter-in-law is very thankful. Because I can say that my most productive *cough* experiences were only with intact men. And, one of them was a keeper.