What does 态度 mean in 她礼貌不礼貌是她的态度? I wrote this (Kong Lin has just met a non-binary person, and the narrator describes her mental process): 


  反而孔琳觉得无所谓，别人的性别不是她的选择，不过她客气还是不客气就是她的选择。


It's intended to mean something along the lines of:


  Instead, Kong Lin doesn't really care, another person's gender is not her choice, but being polite or not is her choice.


My teacher changed it to the following (I think, I may have made a mistake):


  反而孔琳觉得无所谓，别人的性别不是孔琳能决定的，不过她礼貌不礼貌是她的态度。


I'm completely puzzled by 态度 = "attitude" being used here.  Searching for 是她的态度 gives results which lead me to think there's a meaning of 态度 that I don't know, and I've transcribed her corrections accurately.

Question: What does 态度 mean in 她礼貌不礼貌是她的态度?
It's easy to get tangled up between languages and end up confused. Teech was probably in a hurry and a bit confused. 

My tip: take your original language and simplify it as much as you can, then translate. If that doesn't do it, paraphrase, then translate.

态度: attitude towards someone or something

相反，孔琳其实并不在乎，她不能决定别人的性别，但是她可以决定自己的态度。