As others have mentioned, OSX is immune from the DHCP side.
Even then, at least the exploit for DHCP I saw manifests on the SERVER, not the client. When you are in a coffee shop, you are the client not the server. That means you would be the one to exploit the coffee shop, not the other way around.
No, the DHCP exploit was not on the server. It showed a sample payload a malicious DHCP could send to a client to achieve RCE. Also apparently some networks allow other clients to send DHCP commands so even if you trust the DHCP server it doesn't necessarily mean you are safe.
Even then, at least the exploit for DHCP I saw manifests on the SERVER, not the client. When you are in a coffee shop, you are the client not the server. That means you would be the one to exploit the coffee shop, not the other way around.