It is sad, really.
The gun tough guy is no different than the Jeep tough guy (or insert brand x).
The guy who will fight tooth and nail that his brand of truck is the best has never traveled anywhere- guaranteed. The more people travel or drive off-highway, the more they realize that brand is only a preference, not a requirement. The skills translate and every vehicle has its strengths. I lost count of the number of guys with fully built 80 Series that have never left California. The Mojave Road is their "expedition". These guys are clueless and the first to bash someone else's vehicle choice.
The same goes with guns. The guy that argues the AK is the best gun EVA! has certainly never been in combat and I can promise they spent more time shooting off-handed at paper targets than anything else. It is the ignorant that form quick judgements. Nearly every gun has its strengths, and I enjoy shooting a SCAR as much as an AR, as much as an AK, as much as an HK93.
It is insecurity they are displaying. Insecurity is always a tell for lack of experience. . .