[arp242]

Just ignore replies, especially when they're argumentative or rude. It's not a hard problem to solve.

Not sending a simple "sorry, we're proceeding with other candidates" is detrimental to everyone, because without knowing if you've been rejected or not you're just incentivised to send out more applications, which doesn't really benefit anyone, including companies who will now have even more applications to sift through.

Also I've had companies ghost me after doing several what seemed like promising interviews. It's okay they decided to pick someone else, but outright ignoring at this stage is just being a dick. "Begone peasant, you're not even worth talking to".