I had triple negative. After I did research on tnbc I felt really isolated. My mum had 2 primaries - hormone positive and I disconnected from her experience. Then I found out I had to have chemo and she didn't need to either time. I felt even more disconnected from her.
Maybe this lady was the same with her experience, instead of it giving her a bond with other women with breast cancer, it makes her feel alone and isolated as she is looking for someone going through the "same". It doesn't make her right, but it may just be her way of processing her experience.
I'm letting go of that mindset (slowly) because whatever "type" of breast cancer or whatever treatments or surgeries or side effects we experience - it would be hard to find someone exactly the same.
So don't be angry at her, be sorry for her. Instead of embracing love & support from from the only people who understand how it feels to hear the words, "I'm sorry but you have breast cancer", it seems she is rejecting that.
Love the pun btw, I'm glad you got it off your chest, that's what we're here for. That's what that lady is truly missing out on.
Congrats on the walk!