I think this woman seemed not to understand the severity of the situation.
She may well be right that most of the population will get the virus. I believe it has been reported there is already a real possibility that something like fifty per cent of the population has had or is currently suffering from the virus. I think the point she is missing is that, even though that may be true, if nothing is done to try and stop the unusual speed of transmission there will be many more people who die from a more severe form of the virus than if it is slowed down using these various measures introduced.
Doctors are already saying they are having to make difficult decisions regarding who is "most suitable" for ventilation. If thousands of people are presenting at hospital at the same time, with severe breathing difficulties, there will not be enough ventilators to keep all of them alive.
I think perhaps the presenter, instead of shouting about how irresponsible she was, could have presented her with the facts. Perhaps he could have explained the point re speed of transmission and its implications. He could have said that whilst she would usually be at liberty to forego, or take risks with, her own life, she did not have the right to, by her own behaviour, impose that risk on other people - whatever their age may be.