Maybe when I was younger, like a teenager or early 20s. I was a lot more emotionally charged then, a lot more unstable and latched onto the things that made my life less miserable hard-- my characters and stories were just that. But I'm like, almost 30. Basically a hag now. haha; that is to say, I've matured, I like to think. I can't remember the last time a random commented something bad on a character that effected me in any way honestly.
Of course I have characters I created and accidently poured too much of me into them. A great example is Louis, I guess. He's from a private collaboration project. Abused teenager with a big attitude that masks his fear. Self destructive and suicidal hidden behind typical young man gusto and humour. Funny since I'm a woman, always have been, and nearly 30. But it's hard not to see him as the younger version of myself, I suppose.
Now if people made fun of him or whatever I don't think I'd care. The only person who can irk me in regards to him is my collaboration partner-- and boy howdy does she. Louis was horrifically abused, and had become very sex repulsed. He was meant to be a side character to foil a main character-- not important. But my friend got attached and made him a ~love interest~ and no matter how many times I rejected the idea she kept talking as if it was a done deal and happening. So I told her Louis is not capable of ever creating a family due to his hangups (since her happy endings are always married with kids). Yet she pushed it and kept talking as if happy family with 2 kids was the epiloge no matter how many times I said no.... so, uh, I killed him. I wrote a short story about how that life would ruin him, how he'd grow to hate his family, and result in his suicide. She doesn't want to work on the story anymore.
All that said, I think that's more being bothered with the lack of respect for me, not Louis in particular. He's just the proxy. She does have a habit of bulldozing. And then I retaliate with sabotaging the story. Vicious cycle, really. Though she and I haven't wrote anything together in years, and she has a baby now. It's for the best. She and I shouldn't write together.