HaLeiVi: The proper response should have been “that’s only if he’s a Talmid Chacham”. Does it have to be gooey? I always assumed that it still applies even after it’s dried. Any Makor either way
(I was once eating somewhere and I noticed that somehow a little gravy had spilled on my clothes. To this day I am unsure if I dripped it myself without noticing or if one of the young children present had splattered it on me. I was worried about this Halachah. Someone beside me asked why I was so worried that I was going to run home and change. So I told him the Gemara and the Halachah. He told me, “It’s okay. No one will think you’re a Talmid Chacham because you’re not wearing a white shirt anyway.” I was offended, but I realized he was right. It was quite Ga’avadik of me to think of myself as a Talmid Chacham in that regard. But after thinking it over, I realized that because there are a fair few number of people who trust me for learning and for P’sak, this Din probably applies to me regardless of how much I actually know.)