Unless you were previously known to them or legitimately made them anxious for some reason, most of them will have forgotten your name. (If we are talking about a few-year gap.) It's normal for a crank to get offended when their idea is shot down, it's only when it turns into extended harassment that it becomes noteworthy. If someone told you about a perpetual motion machine a few years ago you might remember it but probably not their name.
I have gone through something similar to you (I know how priceless your recovery is and I know that the subtle stuff takes years to mend). Here is what I would tell you:
It's a war story, not a sob story. You've learned a lot that many people never will. There are lots of interesting things you could tell; you have, I'm sure, learned a lot about the mind and soul, about human behaviour. This sort of thing can help you be more successful because you have more insight into how other people's minds work. "Own" your past behaviour—show why it's interesting rather than apologising/showing how "you're better now"/are safe to be trusted. You can use humour to lighten it up, but intellectual people often want to learn more about the hows and whys.
People are prejudiced about mental disorders. Unfortunately. I've noticed subtle changes in first impressions if I speak freely to people. Now I understand what "covert racism" is. People treat you with respect but somehow you get far fewer follow-ups to the proverbial résumé.
Once people have formed a relationship with you, hearing your story actually makes them gain respect for you. But don't volunteer too much too early is my advice.
Nothing says "sane" like face-to-face. If you meet someone in person and they get the impression you are a normal, intelligent person, this carries a lot of weight over any written or word-of-mouth communication. If you want to start on the right foot with someone, try to catch them at an event, or better still, have someone introduce you. (Dammit, COVID.) I'm not saying this is guaranteed but if you want to apologise to someone, and you have the option to do it in person, do that.
Find the language. For unusual experiences like this, it's hard to find the right words. It's easy to fumble or say nothing, which leaves people confused or making the wrong assumptions. I had to learn to say "oh, sorry, I got overexcited, that's embarrassing" and "sorry I'm not feeling well right now." Sometimes it's about spin, for example "I became obsessed with an idea that wasn't very good" compared to "I had an idea that was utterly insane and acted like I had just discovered one of the biggest breakthroughs ever." I'm still not very good at this. I like to tell my story from my perspective, when the "objective" perspective is probably better most of the time.