Woudln't worry about it unless he looks like this
Just because someone wants 33 rounders for their glock or other gun doesn't make them a mall ninja, or huge edc pack.
I got one of those 33 rounders for my glock, used it once. Big waste of ammo.
The term "mall ninja" is throw around losely imo.
Definition for mall ninja:
A person who claims to be an expert on weaponry and likes to brag about their supposed expertise.