A gentle note to anyone reading, fiberglass insulation requires wearing air filters, for the same reasons noted else in this thread. Wear them expecially to cut it, but also just putting it up or working in a crawlspace with it.
https://www.owenscorning.com/en-us/insulation/pink-next-gen-...
Sure it's not good for you, so using PPE is certainly warranted, but it's on a whole different level of badness compared to asbestos.
[1] Per wikipedia, there are some varieties of mineral wool used for high temperatures (think insulating industrial furnaces and such) which are carcinogens.