To be ‘reproached’ (or mocked for it) is a ‘great undeserved honour indeed’.
(i) of ‘all men’:
“for for this we both labour and are reproached, because we hope on the Living God, who is Saviour of all men — especially of those believing.:” (1 Timothy 4:10)
(ii) of ‘all the world too’:
“We have seen and testify that the Father has sent the Son to be the Savior of the world.” (1 John 4:14)
(iii) Yes, (as apostle John explains), Saviour of the “World” means NOT just for “ours” (Christians) only but also for the Propitiation (turning away or the ending of the ‘wrath’ of God) toward sins of the ‘whole world’ too as this verse so ‘clearly’ describes (this truth):
“and He Himself (Lord Jesus Christ) is the propitiation for our sins; and not for ours only, but also for those of the whole world.” (1 John 2:2)