I never used to wear sunglasses, but then I started wearing them about 10 years ago and now they're almost a complete necessity, like sunglasses have done to my eyes what a back brace does to your back if worn too often

They're like the hippies of the inhuman world

Steam Daddy is what the ladies call me

Could be that these creatures are different because of location, college is a social environment so they may be built for that and the campground is more like venturing out into the woods where human contact is generally scarce.

Also the campground creatures appear to be older, possibly from a time when human population was a lot lower, so dealing with humans is unnatural for them.