Yes I've had a prominent Flat Earther tell me that. They forget we have windows as well as instruments.
You can also play around with it at http://www.gcmap.com
Pick a city pair that you see being flown on FR24 and check the GCR on that website....
Most modern autopilots can be programmed to fly on a true track, so flying an aircraft due east or west is possible.
These are from the same cold front, but taken off the coast as we arrived into Sydney yesterday.
Separate names with a comma.