shabbat - Is a psik reisha d'lo nicha or d'lo echpat judged against a communal standard?

If I perform an action on Shabbos which will cause a secondary (forbidden) action, the secondary action is assessed as to whether it is desirable, detrimental or neutral (as per Difference between Pesik Reshe Delo Niha Le, Pesik Reshe Delo Ichpat Le, & Melacha She'en Sarich LeGufa) .

But when determining if the resultant melacha is detrimental or irrelevant, does one look at the individual performing the action at that moment and his sensibility or is the standard a Jewish equivalent of a Reasonable Person standard? There might be something that I find detrimental that someone else might find desirable and vice versa. Does the halachic status of the behavior hinge on which one of us performs the action or is there an external and objective standard?