Being contaminated does make you a radiological threat to others. That's why the caregivers at Chernobyl required radiation protection and decontamination protocols. Their patients were not only badly irradiated but also contaminated by reactor ejecta.
When your misconception was first being discussed, you pointed out that people who had undergone radiation treatments for cancer were told to stay away from others. Your betters pointed out that this was true only for people who had ingested radioactive substances (i.e., had become contaminated), not people who had merely undergone therapeutic irradiation. So yes, you did claim at the time that people who had been irradiated became a danger to others. You were wrong about it, but that was your claim.
You're allowed to change your mind when corrected. You are not allowed to pretend you never made the incorrect statements in the first place. Quite a number of people in this thread have expressed gratitude at being educated by knowledgeable contributors. You, on the other hand, arrogantly persist in claiming you've been right all along—even when it's painfully obvious you weren't—and in complaining about how badly others are treating you. Given your especially unpleasant attitude today, perhaps you need to take a break and return to the thread only when you can focus on something besides yourself.