i'd love it if i had encountered this guy. his attitude and demeanor only confirms that what we need to take place is occurring. tso's are being fed up with the overall treatment they recieve from passengers. his remarks reflect burnout, and contempt towards passengers. my initial reaction would have been same as yours, file complaints and do everything possible to send this guy back to the drive-up window at mcdonalds.
on second thought, i would leave it alone. if the guy has the cajones to verbalize his trash thoughts to a passenger, he already has his head in the noose. i'd smile, thank him, and tell him to have a nice day.... and i will be taking fries with that!