For a Migraine suffer even if you are not in a headache.... strong chemical scents can cause overwhelming pain! Unfortunately your sense of smell is connected to your emotional part of your brain on a deep level. So it affects you very very deeply.
Virtually everybody has some sensitives... For some it is scent, others visual, others it will be touch and other ir might be sound, others it is motion (car sickness) Even though most people experience some sensitivities they are completely callous to people who experience difference sensitives.
What If my OP had said JW's came to my door, and when I answered it they flashed a laser light in my eyes... Or what at if I said as soon as I opened the door they started playing extremely loud music. Or what if I said they constantly touched me after I opened the door.
I am sure if I had used any of those previous examples... I would have tons of support. All of those things are rude and unacceptable. What you have to understand... even though you as well are sensitive to those sensations.
How come when it comes to lights and sound and touching we have to be polite... but not when it comes to fragrances. If some one shines a bright light in your eyes you can close your eyes. If noise is too loud, you can put in ear plugs. If touch bothers you you can move away from the offender.