What is "This"?
Oh, do you mean Chris becoming an icon who has a cult surrounding/supporting him that he completely ignores while he faffs about and has sex with a very willing older lady?
Well see, years of trolling has tempered the man into unbendable steel.
Just like with his current short stay in jail which will end with him facing very little in the way of consequences, he has learned, accurately, that those strong of will who do and take what they please are rewarded in the end, as the timid will see in you the strength they wish they possessed and be drawn to servility.
As to him acting on Barb's long standing transparent lust for him, the logical endpoint to his aversion to race mixing with niggos is that the ideal partner is one that is not only genetically similar to you, but 50% genetically identical.
Sadly Barb is surely infertile; had bob died sooner/she accepted how she very obviously felt about Chris earlier she may have birthed Crystal Chandler, who would be ~75% genetically identical to Chris and thus sleeping with her would've been tantalizingly close to having sex with a youthful version of himself in female form.
So I think I agree with others, probably the trolling and years without bob that allowed him to thrive as his own man.