Some people always seem to be bitten while others are spared. This is because each of us has our own individual smell which can make us more attractive to insects. It is also possible that some people are bitten but their reactions are so mild they hardly notice the bite.
This is a companion discussion topic for the original article at https://patient.info/news-and-features/the-best-ways-to-prevent-insect-bites-this-year