Yes it is nonsense, Standard Fat Joe has ZERO chance a government ZERO... Hence nonsense, opinion doesnt even come into it.
Lets forget about guns for the moment.... Does the average Joe have suitable supply lines
The resistance in Vietnam and Afghanistan was led by trained militia groups and soldiers—most of them professional—well equipped with a modern arsenal provided by friendly nations.
They were fighting opponents who were not committed to total war, and who never committed more than a token force to the battlefield. They never faced a full scale conventional army at full strength. IIRC, America's combat strength in Vietnam never exceeded 60,000, and those troops were spread across the entire country.
There has never been a single case of American citizens taking up arms against their own government and successfully defeating the US military. It is literally impossible, they would be obliterated in minutes.
This isn't top trumps and they wouldn't just line up in a field and shoot each other with their biggest guns... now I'm not saying an armed population would win but they certain can deter a tyrannical government and they certainly wouldn't be obliterated in minutes - even with the might of the US army the US landmass and scale of its armed population is too much for them to hard police in a conflict and that assumes it came down to a situation where everyone in the army took the side of the government and everyone else took the side of the people.
Fitness, training and the reality of how many would actually get off their arses and fight are the far bigger factors in such a situation than the imbalance of what each side are armed with.
It would be a different situation again if you had the US military operating from the US mainland against a similar country with an armed population, but in this kind of situation they'd lose much of their own supply lines, maintenance and production capabilities - they would quickly exhaust their available stocks of things like cruise missiles, even fuel for tanks and aircraft, etc. and the people could much more choose when and where to engage and where not to. The US military would have to consolidate their positions - the military upper hand would be much diluted when spread out over such a large area - so they'd have to pull out of many bases, etc.
As for supply lines - there are private individuals in the US with stocks of ammo which would put many countries to shame... there is a video somewhere of a guy with like 12 shipping containers stuffed full of boxes of .308 after rumours of an incoming ban :s
Mat's vault from Demolition Ranch:
Is far from an anomaly in the US - I used to play Quake 3 CTF with a US clan and several members had similar size collections of guns including .50 cal rifles, etc. one guy used to work part time for a gun shop so he could own all kinds of stuff - not sure I still have the pictures but he had row on row of AR-15 pattern guns all decked out in fancy accessories and enough ammo and parts to last a zombie apocalypse.