Again, this is from 2016, but still relevant. There are a lot more stupid people than smart out there.

Differential equation prompts economist's removal from flight

For his part Menzio said he was treated respectfully but is bothered by the possible sentiments behind his neighbor’s suspicions. Menzio said that a “broken system that does not collect information efficiently,” should not be triggered by “people who may be completely clueless,” according to the Post.

“Not seeking additional information after reports of ‘suspicious activity’ ... is going to create a lot of problems, especially as xenophobic attitudes may be emerging,” Menzio told the AP.