I just read about the Thunderbolt port vulnerability but it seems that port is interchangeable with USB C, just faster? But basically any USBC ports are vulnerable then? Or just the rounded ones like on phones?

Normal USB 3 rectangular ports on PCs are fine?

No, they are not interchangeable, they just have the same form factor.
While every Thunderbolt port supports USB, not all USB(-C) ports have Thunderbolt.

Thunderbolt is basically external PCI-E with extra steps.

USB is USB.

got a link to a good article on the details?

Oh, and USB-C is just a connection standard, not a protocol. And it supports USB, power, analog audio, DisplayPort, Thunderbolt, MHL and potentially proprietary protocols. And devices (and cables!) can support different sets of these features. It's awesome, but it's also a mess.

@Wisecrack https://wired.com/story/... if you meant details of the vulnerability. Take it with a grain of salt though, the aspect of this attack that this article focuses on sounds scary but is completely impractical. Those researchers found more dangerous vulns.