Redfred, you are clearly a very ignorant person so I am going to go through things simply for you.
1. You can sit behind a desk with a box of tissues and work at a computer without harming yourself or infecting other people who will in turn have a take time off work.
2. You can sit behind a desk and work at a computer without breaking food hygiene regulations.
3. You can sit behind a desk with blocked ears without bursting your ear drums.
There is no reason whatsoever for taking time off work with a mild cold if you work in an office. If you are crew you are forbidden from working and can cause yourself serious damage if you have a cold. Should the rules be the same? No.