CW: bugs
I'm willing to bet that a lot of cybertronians would initially be grossed out by demodex mites. If you don't know, demodex mites are microscopic parasitic arachnids that live on mammals' skin and feed on dead skin, hair/fur follicles, and natural oils. All humans have a population of these little guys nesting around our faces and hair. While demodex mites are parasites and infestations can happen, they're typically harmless and a perfectly normal part of life.
I personally think demodex mites are cute and I'm so glad that I get to share space with such interesting creatures, so of course I would happily pester all of my transformers friends with this fact.
From the perspective of a mechanical being, though... yeah it's not surprising that our metal friends would cringe. I enjoy picturing Ratchet being reluctant to touch humans because, of all the things that he finds gross about us, he now knows that there's tiny little creatures burrowed into our hair follicles at all times. Fucking ew. Optimus why do you like these things??? They have BUGS.
Especially since cybertronians don't really have stuff like that. As far as I'm aware, there are no commensal or symbiotic relationships that their species has, so all they have to compare this kind of thing to are parasites, which are usually lethal to them. Scraplets are fatal. Those weird plants from G1 that ate metal and reproduced like crazy (and also tentacle-fucked Perceptor), were fatal.
"Hey. Hey. Wanna hear about my bugs? Aw, c'mon, you know you wanna hear about my bugs. My cute little guys? My tiny babie-"
"SHUT UPP!!!!"

















