Well the thing is that there's a very apparent idea that it's just self sacrifice... but that, as Gaban framed it, wouldn't warrant the complete and deliberate suppression of the memory.
People will say I'm being mean (even if they know I'm not), but there's a beautiful idea if WCI was written as Sanji resigning himself to a lavender marriage. In any case, Sanji has been running literally and figuratively to avoid something he perceives as selfish, so I assume from the context of Kamabakka that it's related to how he chooses to live and express himself. Because absolutely no one intends to stand in the way of him reaching All Blue or whatever.
Although I still believe that the way he demeans himself "for women" is a serious character issue, this may not be the hint. Unless this is part of a self expression issue.