First, I'll start by saying that, all things considered, you're not doing a horrible job, despite the reaction you're getting. So don't let people or things like this copypasta get to you too much. I think most people, at some level at least, know that a lot of their gripes aren't your fault and that you are just the messenger getting shot at and that your job is really tough, at least in situations like this.
Anyway, I think you are looking at it this specific thing the wrong way. It wasn't that you asked a question or asked for feedback. It was how you asked it.
You posed it as "isn't it kind of your fault? Now prove how it isn't" or something like that. No matter what, that's going to rub people, especially already frustrated people, the wrong way. Call it, not knowing your audience, or not reading the room, or whatever.
You're kind of missing the fact that people don't generally like to git hit with a devil's advocate argument in general. It's usually pr...