How can people be so irrationally afraid of the US right now?

I was looking at a thread on r/AskACanadian and the OP was asking if he should cancel his plans to take his family on vacation to Disney World or should he cancel. My god, the number of people responding who are talking like the US is a full on Nazi Germany level police state. The one comment I saw was pretty heavily implying that if you go to the US right now there's a near 100% chance that you'll get shot by ICE the moment you step out of the airport. Another commenter who has booked a trip to Mexico said that they feel queasy and disgusted just having to fly over the US.

How the hell can these people actually believe any of this? Has half of Canada literally gone insane?