A few clarifications.
Firstly, facial hair is (biologically) supposed to cover pretty much the entire lower front half of your head. Calling a man "neckbeard" is like calling a woman "chestboobs"; they may well be offended, but it's not actually an insult, the thing in question is supposed to be there.
Secondly, having a beard doesn't itch- not having a beard (or, more to the point, hairs growing in those first few millimeters) itches. Once the hair comes in, the itching stops. Shaving is, by and large, for the impatient (or for those smooching the hairy ones; I claim no firsthand knowledge on that front); the genuine inability to grow facial hair is rather uncommon, most people just can't be bothered to wait. As Chesterton so eloquently put it, "you cannot grow a beard in a moment of passion", after all.
Firstly, facial hair is (biologically) supposed to cover pretty much the entire lower front half of your head. Calling a man "neckbeard" is like calling a woman "chestboobs"; they may well be offended, but it's not actually an insult, the thing in question is supposed to be there.
Secondly, having a beard doesn't itch- not having a beard (or, more to the point, hairs growing in those first few millimeters) itches. Once the hair comes in, the itching stops. Shaving is, by and large, for the impatient (or for those smooching the hairy ones; I claim no firsthand knowledge on that front); the genuine inability to grow facial hair is rather uncommon, most people just can't be bothered to wait. As Chesterton so eloquently put it, "you cannot grow a beard in a moment of passion", after all.