I've become familiar with several different classes of horrible fragrances that people use. There's the one that smells like salty roses, one that smells like 'old ladies' (this gross light flower-lavender scent?), one that's like a bunch of synthetic grapes and other fruit, the 'cotton candy' kind of dryer sheet scent, some that smell like flowers mixed with burning plastic... not sure which one you might have encountered. I find if I take antihistamines it's more 'huh, I smell that' vs. a toxic emergency, but I prefer to just avoid it. I do hold my breath in some circumstances, like if I have to walk down the laundry detergent aisle in the grocery store.
I actually can smell many people's scents from 5 feet away and still smell their fragrances after they exit an area. I'm probably more sensitive because I don't wear clothes coated in this stuff and sleep in sheets soaked in it.