I have a couple times. The last time was a couple years ago with someone I met online who I was getting to know but didn't like after the first date. They asked if I felt like watching some movie and I didn't respond and they didn't follow up. Tbh, I probably would've answered if they had sent a second text. I guess I avoided telling them the truth but it stuck with me like a pebble in my shoe and I feel bad thinking about it.
After my divorce, I had a random friend tell me that they were bummed about my divorce because they (him and his wife) had wanted to swing with us. Gave me the ick. I was SAd when I was a kid, and so people expressing interest in me is like a train crossing signal at night, big red blinking light with loud bells, all I can foresee is what terrible things they're capable of if given the opportunity.
Then him and his wife got divorced, and he started texting me, calling me, emailing me, like he couldn't believe I didn't want to hook up with him. ghosted him HARD. I felt bad about it initially, but after he kept texting/calling/emailing for weeks, I was moreso relieved that I never gave him any more of my time/effort.