What is it with crabby substitutes?

Today in Spanish we had a sub and she spoke very loud. Our regular Spanish teacher always speaks in Spanish, she almost never has spoken to use in English. the sub spoke in Spanglish and I made a remark to myself about how I don't like Spanglish because it's confusing. She overheard me and went on about how I'll be hearing Spanglish all the time because people in Mexico don't really speak in proper Spanish, they use Spanglish because the majority of them are not properly educated. I know lady, I've been to Mexico three times, I have relatives there. And I wasn't really talking to you anyway. However, I suppose I should give her some slack, she did mention (in Spanish) how Spanish is her native language and she speaks a bunch of other languages too.

In Biology we've had a sub for weeks now because our regular teacher is on maternity leave. We were watched two videos on the cell and the second one was freaky, let me tell you. They had creepy, harmony type music in the background and the narrator's voice was ... indescribable. Kind of like an insightful poet's voice; she even used poetic language to describe it. Nevertheless, the visual was quite boring and her voice itself distracted from what she was actually saying. So, a girl named Kiara (could be spelled differently) rose her hand and said "I really don't think anyone is actually getting anything out of this video, so I think we should have a class discussion instead."

Our sub replied, "I think you should be quiet and watch the movie."

And that was that.