Does committing a sin after Hajj indicate that the Hajj was not accepted or that it was not "mabroor"?

Insisting on sin after an act of obedience may indicate that the obedience has not had an effect on reforming the servant. A believer must be cautious about their act of obedience not being accepted and strive for repentance. The occurrence of a sin after Hajj is not evidence of its non-acceptance, and one must repent whenever a sin occurs. Remember that the believer "was created tempted, oft-repenting, forgetful; if reminded, he remembers," and that Allah loves those who repent, so do not despair of repentance.