I have a relative that worked for a US medical company. There were certain people who would take women's lunches out of the microwave right in front of them just so they could cook their own. She said they were mostly from the south central area of Asia (India, Pakistan, Bangledesh). It was only a few individuals, not everyone.

Obviously this is a secondhand story, so I can't vouch for it directly. I was shocked and could barely believe what I was hearing.