I hate it when I ask someone a question and someone else answers it for them.

Reasons :
1) You know a different side of the story
2) I asked her/him, not you. So STFU
3) I rather hear it from the horse’s mouth than from another person

I really just hate it because I specifically asked that person a question/ to do an action. However, this other person butts in and prevents them from performing the task or answering the question. I mean, the other person isn’t a lawyer or anything. Neither is the question that I’m asking going to bring them to jail or give them a dead sentence. I find it rude. And being rude really pushes my buttons.