Your hidden agenda is something that you wish you were good at but are unsure about it.

So you sort of resent - or at least find annoying - people who are "too cocky" about it, typically your benefactor but also your activity partner if of the accepting subtype (and possibly other types of the "right" subtype).

So --

ENTjs and ENFjs resent the "excessively abrasive" Se EPs.
ENFps and ESFps resent the "know it all" Te EJs when discussing a subject of mutual interest.
ENTps and ESTps resent the "attention-seeking and limelight-steaking" Fe EJs (especially as they seem to do it "easily".
ISFps and INFps resent the "intellectually arrogant" Ti IJs.

Etc.