Self-acceptance isn't about blithely saying "this-is-who-I-am-and-it's-the-way-I'm-always-going-to-be", (looks like you got that one wrong, Popeye...). It isn't about self-identifying with our weaknesses and shortcomings, or giving up on ever being able to change; it certainly isn't about defending our personal "foibles" and "protrusions of self".
"We all want progress. But progress means getting nearer to the place where you want to be. And if you have taken a wrong turning then to go forward does not get you any nearer. If you are on the wrong road progress means doing an about-turn and walking back to the right road and in that case the man who turns back soonest is the most progressive man. There is nothing progressive about being pig-headed and refusing to admit a mistake." (Case for Christianity)
"I do not think that all who choose wrong roads perish; but their rescue consists in being put back on the right road. A sum can be put right: but only by going back til you find the error and working it afresh from that point, never by simply going on. Evil can be undone, but it cannot 'develop' into good. Time does not heal it. The spell must be unwound, bit by bit, 'with backward mutters of dissevering power' --or else not." (Great Divorce)