You don't have an "auto-immune system". Auto-immune means your immune system is attacking your own healthy cells.
Tattoos are fine. There's some evidence that maybe, maybe, immune system responses can be impacted by tattoos. But changes in immune system response does not necessarily mean impaired or negative.
Thank you doctor Gray.
kinda, but the system is not perfect.
https://en.wikipedia.org/wiki/Autoimmune_regulator
oversimplifying but in every person there are tradeoffs about attacking things inside yourself (viruses, cancer, etc) and outside things (parasites, bacteria, etc) and your genetics influences this. See the old Th1/Th2 balance
anyway it was probably a typo on his part, he's such a sleepy guy..