I like your analogy of an immune system etc. and I bet you're one of the people on the internets who have thought the hardest about these issues. But to be honest in this case I think the OP was just being mean to you.
Kevin Hart talked about how the comedians he came up with throughout his career would incessantly assault eachother with insults, and how this in turn gave him great self confidence and the ability to laugh off anyone who tried to insult him.