FWIW "invading parasites" is a phrase that one should avoid in American English if he or she wants to avoid sounding racist. Many people will read "too much" into it whether intended or not, so it's best to avoid it.
I think you might be a little too sensitive and in all probability I imagine you get offended by the word "dongles" as well. I would recommend descending from your ivory towers for a dose of the real world every now and then lest you lose touch with things that are actually offensive.