Hello florian
My apologies for not responding sooner!
Keep in mind that the Sender hardware address and the target hardware addresses found within the ARP packet are not the source and destination MAC addresses found in the Ethernet header. Now you are correct when you say that:
DAI will cause such frames to drop so that they don’t actually reach the host. These are illegitimate packets and most likely come from a malicious source, so they should not be sent to the host. The host will not have to waste time and resources processing them.
As for this question, my apologies. I had the no ip gratuitous-arp command in mind but this just disables the sending of gratuitous ARP packets by the device itself and not the blocking of such packets from hosts.
I hope this has been helpful!
Laz