It's not just TSA. In fact, I'd say TSA for a lot of people only comes into play when they try to get out of the US again. Though TSA is mandating its ridiculous checks at non-US airports for US-bound flights, too, so I guess they are a pain in the ɑss before you even get on the plane in your country of origin.

Anyway. It's a generally unwelcoming attitude that manifests itself in treating every non-citizen arrival as a criminal from the moment they try to enter the country by requiring fingerprints. But even before that, unless you're one of the lucky few*) who can get in without a visa (VWP), you have a lengthy process of trying to get a visa to go through. I'm told this has finally been fixed, but it used to be you couldn't get in if you had AIDS unless you lied on the CBP form. And currently VWP folk have to pay $10 to get an ESTA approval, which doesn't even guarantee the ability to enter the country.

I've found most Americans to be very welcoming of foreigners on holiday. The same can not be said of their government.

*) Currently, citizens of 36 countries. ISO currently defines 248 country codes.