OP here! This actually happened a little over a month ago. I'm in student housing, so they got our RA to come and mediate a meeting. Things have gotten much better since then, but it still irks me that a 21, 23, and 24 year old picked up a 6 year old's tactics and thought it was a good idea to just ignore me for about three weeks. Ultimately, I'm not doing much different, just making a bigger show of it when I do clean. I never was gross about anything (imo), I just don't believe in the whole anti-bacterial thing, like wiping down the tv remote and couch weekly, or using Lysol on my bed every morning. To everyone telling me to find new roommates, my lease is up in May, and I'm already looking for new people to live with, but at least things have gotten better since all this happened.