I should say "if your hair is more sensitive to DHT", meaning the follicles are more likely to shut down sooner, or be choked off. It's like some people are more sensitive to certain foods or smells or whatever, that others just shrug off. Our body functions are just as prone to internal and external influences, sometimes we're more sensitive to some chemicals/hormones than others.
I should say, I'm no expert, just stating what I understand to be the case based on what I've been told and read from various sources over the years. Happy to be corrected.