Quite a few times, after getting a technical screen, the interviewer's attitude was "You loser! Why are you wasting my time interviewing here?" But I know that I'm really productive and really know my stuff.

When my employer was interviewing, the two best candidates (by my analysis) failed their technical screening.

I don't see any easy solution.

It also seems weird that employers complain of a talent shortage, but they always are looking for every little excuse to reject someone.