On a very personal level, I cannot nor will not speak for anybody else, I choose not to let the situation get me all stressed out.
On another note, I don't use paper products of any kind to clean my glasses. Paper products are made from wood and wood can scratch. I use an old cotton cloth that gets thrown in the wash from time to time.
Speaking of wood, I guess people think TP grows on trees...wait a minute....
Cotton is a bad idea too. It might feel soft on your skin, but is actually abrasive. Plus it'll tend to retain stuff that's potentially abrasive more than other materials (ie: sand, dried swat/salt water). Surgical sterile cotton is different because it's of a different grade. But most cotton that you'd get (diapers, rags, your t-shirt) would likely contain seed shell fragments and other contaminants at a microscopic level that could damage optics.
I use paper towels more than I should for cleaning eye glasses. If you get the ones with the glare reduction coating, they will scratch with paper towels. I was a Bounty person too until I started buying the Sam's Club brand a number of years ago... both TP and paper towels. I suspect Costco is the same. The towels are probably made by Bounty anyway.... who knows. I just like them. I hate to buy stuff like this and hence buy a pile of it all at once when I do.
Paper towels are generally a bad idea. Obviously the brown stuff is terrible. My dad says Bounty microwavable (apparently it says that on the package) and Costco Best are the better choice if you
have to. Brand name facial tissue is about the same level, obviously nothing with lotion.
Microfiber cloths are your best bet. I don't mean the towels/rags (can't speak towards them), I mean ones like you get with your sunglasses or from your optician. Honestly, there's really no excuse not to have and use them. While there's better quality ones for more money, you can get a 100 pack for $7-8 off eBay that are perfectly serviceable (they won't damage your lenses, but cheaper ones might not remove oil/grease as well).
The really good stuff is KimWipes. They're made for scientific kinda stuff. It's what the shop my dad works at uses. He's a master optician who makes stuff for all aspects of aerospace, telescopes, sight windows, lasers, etc. KimWipes is expensive stuff though. Definitely too pricey for buttwiping.
In the end (heh) it comes down to what you're wiping clean. If it's an old pair of Smiths or Bolles or something of the like, it might not matter to you much. If it's some Foster Grants or Walgreens reading glasses, who cares? If it's your new pair of Flexon framed CR-39 Transition lenses with blue light filter and AR coating, or your new Maui Jims or Randolph Aviators, then stay away from paper towels and resist the urge to use your t-shirt, and carry a microfiber cloth.