Just bevause you didn't experience something or don't personally know anyone who experienced it doesn't mean it doesn't exist, I don't know if it's common or not but I can guarantee that it happens, especially the first one, you'd express your opinion about something important and they'll look at you wjth a smile as if you're stupid or talking about something you don't understand/know, they don't even listen to you seriously and just act like they do, then get angry at you after a few minutes, then 20 minutes later they either get angry and refuse to listen more, or say "so that's what you mean, I see now, why didn't you say this in the first place, you really don't know how to explain things properly, you're all over the place, no one will understand if you talk like that". But I didn't even change what I said, this is what I've been saying for 20 minutes, but maybe you should've listen seriously in the first place and tried to understand what I'm saying instead of just insisting I'm wrong, maybe you should've accepted that my opinion could be helpful, and that I know what I'm talking about.