Rules: I have one word which has several (2 or more) meanings. Each of the meanings is a teapot (first, second ...). You try to figure out the word with the conversation between the teapots
Hint 1:
First teapot: Humans are annoyed of my existence
Second teapot: Probably yeah, they are shocked even if they get a hint of my existence
Hint 2:
First teapot: Humans hate me. Do they hate you as well?
Second teapot: Eventually they hate me too, but it has always been complicated
Hint 3:
First teapot: I remind them of their mistakes
Second teapot: So you help them to rectify? I remind them of what they spoke
Hint 4:
First teapot: Yeah, I am useless if I don't show up
Second teapot: Totally agree.. But I am useless if I do