P1) For all slurs, (x) slur's negative connotations have been neutralised if and only if, (x) slur has been rendered non-bigoted via altered usage.
(∀x(Cx↔Bx))
P2) For all slurs, if it is not the case that (x) slur's negative connotations have been neutralised, then oppressed people will continue to suffer from the use of (x) slur.
(∀x(¬Cx→Dx))
P3) It is not the case that the term retard's negative connotations have been neutralised.
(¬Cr)
P4) If the term retard has not been rendered non-bigoted via altered usage and oppressed people will continue to suffer from the use of the term retard, then it is permissible to neutralise the term retard's negative connotations.
(¬Br∧Dr→Sr)
P5) If it is permissible to neutralise the term retard's negative connotations, then It is generally permissible to use the term retard with an altered non-bigoted meaning.
(Sr→Ar)
C) Therefore, it is generally permissible to use the term retard with an altered non-bigoted meaning.
(∴Ar)

P1) For all slurs, (x) slur's negative connotations have been neutralised if and only if, (x) slur has been rendered non-bigoted via altered usage.
(∀x(Cx↔Bx))
P2) For all slurs, If it is not the case that (x) slur's negative connotations have been neutralised, then oppressed people will continue to suffer from the use of (x) slur.
(∀x(¬Cx→Dx))
P3) It is not the case that the term nigga's negative connotations have been neutralised.
(¬Cn)
P4) If the term nigga has not been rendered non-bigoted via altered usage and oppressed people will continue to suffer from the use of the term nigga, then it is permissible to neutralise the term nigga's negative connotations.
(¬Bn∧Dn→Sn)
P5) If it is permissible to neutralise the term nigga's negative connotations, then It is generally permissible to use the term nigga with an altered non-bigoted meaning.
(Sn→An)
C) Therefore, it is generally permissible to use the term nigga with an altered non-bigoted meaning.
(∴An)