Today the 97 year old lady that lives upstairs told me "the stock market only goes up!"

I was walking my dog and checking my portfolio on my phone, which she saw and I said I was "betting against the market" to make it simple since most people I talk to in the wild don't know ish about finance. But then she hits me with, "Ya can't do that! The stock market only goes up!" I expected her to go "brrrrrr" but was disappoint.