Discredit a poll by stating that there is no information on who participated in the poll or who conducted it. Mention that people should question the source of information before believing it. Also, use the example of a ridiculous poll to emphasize the point.
Only a s fool would believe such a poll.   No mention of who took part in the poll,  or who did it.   Obviously ones that don't  watch TV and have not  seen the earth from outer space.   That's one of the problems nowadays, people believe everything they read without questioning where the information or poll  came from .  The US hasn't become the richest and most powerful country on earth  by believing such nonsense.   What next,  are you going to tell us  "A recent poll of Americans found 46% believed the moon was made of green cheese"