I personally get friction coming into the USA because sometimes I refuse to answer questions of CBP so I get sent to secondary inspection

Traveling to Iran also has friction for me because I’m a male of military age so any trip to and from the country (as a citizen) requires a temporary military service exemption which is a lot of paperwork and bureaucratic hassle ahead of time and limits my number of exits per exemption stamp.

That’s my personal situation.

It’s different for others depending on their citizenship and personal profile…