There is no such thing in the Quran of having a beard of a certain size.
Pehle Islam ko follow tho karo, before you go off running to cancel your grooming appoinments.
You are right there is nothing in Quran about having beard, but Quran has basic instruction and Hadis (prophet's words and deeds) form a major part of Islamic Shria (although there is a small group who does not belive on Hadis).
There is quite number of Hadis talking about Beards, all 4 major school (Hanifi, Shafia, Maliki and Humbali) are agree on beards. Only small widow is available as no one saying Beard is a Farz, it is sunnah, but wajib (means a must but still slightly lower then Farz.
On other side i agree with you, that we are also hypocrite that do following our FARZ completely but start arguing on Sunnah/ Naifils.