I do think there is a difference in contamination and pissing someone off or being misunderstood or having different agendas or divisive and so forth. Someone doing something at me with good intention does not necessarily mean I won't get pissed off for any number of reasons that would be valid for me and the validity of my response is not offset by the good intention. But I don't feel contaminated when I am pissed off. I might choose to engage less with someone who I found highly annoying or who I found off-putting, but again - not contaminated by them.
I have experienced situations where I thought I was being quite kind and sensitive only to find I was received as cold and unfeeling.
I don't think I was contaminating anyone - just that there was a mis-match in communication.
(And this is why my partner calls me Sheldon)