It's a rather big leap from clinical psychology (which to my opinion very much follows the scientific method) to HRM (where I would wholeheartedly agree the lable 'pseudoscience' applies more often than not).
Fact is, clinical psychology deduces testable hypothesis from standing theories and applies quite rigorous empirical testing. The discipline as a whole has some problems (both in the good and the bad sense) but I would not agree with your opinion about it being pseudoscience.
HRM and what you call 'management theory'...well, let's just say I know more of it than I would like to. It's not all bad, there enough subdisciplines in the management field that use the scientific method. There is also a lot of post-modern, deconstructivist rubbish which I readily admit could be very well classified as pseudo-science.
My prejudice against psychology is decades old and against one particular university department with which 2 of my siblings who are rather intelligent were not impressed. If you are a psychologist things have obviously changed. I actually didn't mind the psychology subject in my undergraduate degree, long ago though that was.