FE can't debate because they have no evidence, if they did it would of been provided by now.
FE debate is based on direct observational evidence, nothing more. "It looks flat, therefore it is flat." If there were a guy who spent his whole life in a box, he would come to the conclusion that the earth is a small hollow cube. Same logic. FE denies any evidence that is provided by others (NASA is a conspiracy, photos are fake, flightaware.com is falsified) and refuses to acknowledge that there are educated folks who can provide valuable evidence outside the sphere of their little world.
One cannot deny that the earth, from a person standing in Kansas, looks darn flat. The rest of us accept that there are other folks out there who have better evidence than our eyes can provide that demonstrate beyond doubt a round earth.