It's always the people who have never fought in a war that say things like this.
APCs take fuel, require men to run, and need tires or tracks. For $10 worth of chemicals or a little bit of camouflage and some earth work you can make the APC irrelevant very quickly.
Happened in Iraq all the time.
The US military and its members have spent almost 25 years fighting through insurgencies.
There are millions of combat vets.