Now, I am assuming the majority of pilots can do simple addition.

Conservatively, take the grants that are clearly for GA airports only, and
compare that to the number (about $180mm) in combined AVgas and Jet A gas
tax receipts.

Then, tell me the GA is not subsidized. Tell me the Bureau of
Transportation statistics is wrong about GA being subsidized (in that
case, maybe AMTRAK isn't subsidized either).

Or, try and change the topic to economic benefits (I can argue that too:
those studies are rigged), supposed national benefits (true only for
remote areas of the country), etc.

Better yet, quote the Destroyer, who laughingly claims that the Highway
trust fund is "going broke" (completely false, as fed gas taxes exceed
amount of outlays, even with all the pork in the ground transportation
projects) while the AV trust fund is doing well.