I often have problems with phrases that are literally neutral, but have negative connotations. For example: for years, I thought ‘forget about it’ was a polite way to tell someone that they didn’t have to worry about a situation. Eventually, I realized this was insulting. If possible, could you please list some more phrases that are literally neutral but have negative connotations? Possible with the connotative definition?
Realsocialskills answered:
Most of these aren’t always negative, but they can have negative connotations depending on context and tone. 
  • That’s nice (“I don’t care”)
  • Uh huh (“I don’t believe you and/or I wish you’d shut up about this”)
  • Fine (Can be taken to mean “I’m not ok with this, but I’d rather put up with it than discuss it further. I’m probably going to stay mad about this”
  • Whatever (“I don’t respect your opinion and want you to shut up about it”)
  • Never mind (“I wish you’d shut up.” or “You’re obviously not going to do anything worthwhile about this, so I want to drop the subject”)
  • I hope you’re happy (“You’re doing a stupid thing that I have contempt for”)
  • Duly noted (“I don’t care”)
  • It doesn’t matter (“It matters, but I don’t respect you enough to say why”)
  • I guess (“I don’t think I agree, but I don’t want to say why”)
  • Thanks for sharing (“What you said was inappropriately personal”)
  • Interesting (“That’s boring, annoying, or offensive, and I would like you to stop talking about it”)
  • Really? (In certain tones it can mean “I don’t believe you and can’t believe you would say such a stupid thing” or “I think you’re lying to me and I’m angry about that.” It doesn’t always have that kind of connotation, though - it can also just be a way of expressing surprise.)
  • Good luck with that (“That’s a stupid idea” or “That’s going to fail and I can’t believe you’re trying it”)
  • If you say so (“I don’t believe you and can’t believe you would say such a stupid thing”)

cosmicfingertips said:

I really hate “Sure” when you ask someone if they want to do something. “Sure” is not an endorsement of an idea, it’s acquiescence; it makes it seem like you don’t really have any interest in whatever it is but you’re going along with it because you don’t want to upset the other person. I know some people don’t see it like that but it always makes me anxious. “Do you want to do [X]?” is a yes or no question, and “Sure” does not mean the same thing as “Yes.” Not to me, anyway. It’s like a “Whatever.”

realsocialskills said:

That is often, but not always, the case.