There's a difference between being defensive about your characters and loving them.
To take a metaphor from my other work: I work in a school, so I see a bunch of parents and a bunch of kids. Some parents don't love their kids, some do, but whether or not they're defensive about their kids has nothing to do with that. Some of the parents are defensive about them because they take any critique of their kids as personal insults about their parenting skills, their beliefs, their morals, etc... When the critique is actually about their kids and their behaviour.
These defensive parents can't separate their own identity and self-worth from their kids' actions and percieved value, so any critique, even if it's legitimate and given to help the kids grow up into good well-rounded people, gets rejected and taken in anger by the parents. This usually means the kids won't get better, and the parents won't listen to good advice even more the next time: everyone loses.
Your characters are even more reliant on you as their "parent" to not be pig-headded and listen to critique, especially when you asked for it, so that you can improve as a writer and give them the wings they need to soar. By being like this, you are actively pushing your characters' noses into the mud.
Also: don't think we didn't notice the ragebait promotion thread. I'm answering just in case this situation actually happened to you and you actually do feel this way, but if you're just trolling you'll make no friends here.