Years ago, while applying to some security engineer position at Google, they were testing low-level skills focusing on vulnerability research, C/C++ and x86. At that point having spent 10+ intense years on that arch: having written binary translators for it, reversing/exploiting software and writing a micro-kernel. After rejection, they recommended me to read a "x86 assembly 101" book which was truly infuriating at that point.

Granted, it was an automated email, but an automated "No" would have been more appropriate. Is it so hard to offer different standard responses? Why does the company consistently fail at human interaction, be it candidates or customers?

From my circles, most share the feeling that FAANG/MSFT are insulting for candidates (I can only speak for Google/Microsoft).