I've always wondered something though, and I don't mean to offend, but what is the impetus for this sort of response? "Some people are having X problem" getting the response "Not me." It's like "My bone marrow appears to be cancerous" getting the response "I've had my bone marrow for 40 years and it hasn't produced a single cancer cell." Or "My ford pinto's gas tank ruptured and my car burst into flames" getting "I've had mine for weeks and it hasn't produced a single fiery explosion."
I mean I do it sometimes too, but I've always wondered why people do it. It's like a strange compulsion.