Genre and place in the book. Part of the book's "wrongdoer / judgement" series (4.6 on the fig-tree, 04-07 "take away the judgement," 04-08 "it does no harm"), but taken at a precise point: the discipline of assent in the situation of an insult. The question is put bluntly — whose judgement will you adopt?
Three judgements. Marcus distinguishes three ὑπολήψεις of one and the same thing: (1) how the ὑβρίζων (wrongdoer) himself judges it (he is sure his act means something, that he has touched you); (2) how he wants you to judge it (so that you reckon yourself insulted, humiliated); (3) how things are κατ' ἀλήθειαν — in truth. The imperative is simple: reject (1) and (2), hold to (3).
Do not hand your judgement to the wrongdoer. The subtlety is that the wrongdoer not only holds a false evaluation — he wants to impose it on you: the insult "works" only if you adopt his frame (that something shameful or harmful has occurred). Refuse the frame, and the very act is disarmed. The same move is in Epictetus (Ench. 20): "it is not the man who reviles you that insults you, but your opinion that it is an insult." Linked to the formula "all is judgement" (02-15) and to "take away the ὑπόληψις" (04-07).
ἴδε κατ' ἀλήθειαν — the bare view. "See things as they are in truth" is EXERCISEthe bare definition: strip away the social-passionate overlay (the offence) and see the fact as it is. The same operation as in 04-07 (ἆρον τὴν ὑπόληψιν), but here the source of the false overlay is personified — another human being, actively pressing his opinion on you.
The disciplines. The principal one is assent: which TERMjudgement to fix (not the wrongdoer's, but the true one). The secondary is desire: not to admit the passion of offence that would be born from an adopted false evaluation.
Parallels. It is not the wrongdoer but your opinion that insults — Epict. Ench. 20; "all is judgement" — 02-15; "take away the judgement" — 04-07. The wrongdoer can neither harm nor define you — 04-08; Med. 9.42; 02-01. To see a thing in truth, without accretions — 02-02; Med. 6.13; 8.24 (see EXERCISEdefinitio).