Nothing ruins my whole day but explaining things to me I already understand/speaking to me like I’m stupid will ruin our whole interaction or relationship if they keep doing it. If I don’t know something I’ll be the first to ask questions, seek out instructions and help, I hate feeling unable and will do what I need to to learn but if I’m doing a mundane task and you start telling me how to I’m instantly 100% over you, why do you think I don’t know how to do this??