I think what these women are saying is, "I personally find wearing a pad disgusting" and not "Women who wear pads are disgusting." I definitely would call pads gross or disgusting, and when I say that, I mean that is my experience with wearing them in comparison to tampons.
With tampons, the blood doesn't make it to the vulva, in general. So the vulva stays a lot cleaner. If you wear pads, the blood flows out, so it dies and cakes on your pubic hair, labia, and anus. In addition, you can feel the blood once it exits, so there's a continual "gooey" feel, squelching when you sit down, etc. I honestly don't know why women who wear pads prefer it.
To be clear, I don't have any hygienic concerns with pads, nor with women who wear them. It's just that both the mess and the felling caused from wearing pads vs tampons I personally find gross.
I've had little further discussion or interactions surrounding it, but that one anecdote basically reinforced my gender role of being weird about going to the store to buy them for my partner.
I found this which sounds like pads are used more: http://lipglossandabackpack.com/feminine-hygiene-around-the-...
The first sentence is: "Tampons are used by up to 70 percent of menstruating women in the United States today, and the average woman may use as many as 16,800 tampons in her lifetime."
And here is another statistic: https://www.ncbi.nlm.nih.gov/pubmed/22980411
They're both not clear though I do think it's fair to say tampons are preferred. Just google for "tampons vs. pads".
It's really not pleasant stuff to deal with. Plus, it is contaminated by mucus of varying amounts and thicknesses.