Excuse me, but can you speak Japanese?
If you use "anata" in an actual conversation, it often sounds impolite.
Would you think I’m rude if I told you that you’re fat?
When you do something that's your fault and then you say "thanks" after you do it, that's super-duper rude, wouldn't you say? Imagine doing something like this and then thinking to yourself after... wow, I was really rude.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.