'Damn, don't be so triggered'

[Azuren]

Tulipanzo said:

Racial slurs aren't dark humour

I would have probably told him to get stuffed by the end of your fifth paragraph, thought judging these things in person is never as easy as in hindsight.
You were as harsh as you needed to be, don't feel bad for tossers

They are, however, often used as the punch lines in dark humor.