Total bull crap. This is exactly the same as saying "If you are a Muslim, you must be a terrorist." Please do not paint with such a broad brush.
I am representative of a typical ex-military man in the USA and I have never had any great love for the State of Israel.
As for the Stingers - I had forgotten how old the system was. Designed all the way back in the early 1970's. Impressive performance back then, and one can only imagine how much they have been improved.
Any stingers still remaining in Afghanistan have long since ceased to function due to shelf life, batteries, cooling systems, etc. Otherwise, we'd have seen their use by now.