Someone threatening to make an insurance claim for imaginary accident

Last week my husband was in a minor incident with another motorist who is now threatening to proceed with an insurance claim. My husband and the other motorist were passing on a tight street as cars were parked down one side. As they passed the other driver stopped and had a go at my husband saying that he should have reversed or waited for him to pass first. The cars did not collide and the most contact there was, was that the wing mirrors touched. I was sat in the back of the car and did not even realise any contact was made! There are no markings on my husband’s car/wing mirror and there cannot be any markings on the other car/wing mirror. Can the other motorist really make a claim against my husband? I cannot imagine there is any evidence that the cars even made contact.