Generally, there are two ways this phrase is used. Either it's a synonym for "Why are you telling me this?" as well as "I don't particularly care," or the person who uses it generally considers what they're responding to as, well, 𝘯𝘪𝘤𝘦. Typically, the former is implied more often than the latter. Often, especially over text, it can seem like someone is being sarcastic when they're really not, because, you know, you can't really convey tone over messages.
Why-are-you-telling-me-this-type:
"Ayo! Connor got this new game and it's totally sick!"
"That's nice."
Genuine-type:
"I feel pretty today."
"That's nice."
"Ayo! Connor got this new game and it's totally sick!"
"That's nice."
Genuine-type:
"I feel pretty today."
"That's nice."
by Shionne November 16, 2021
Get the that's nicemug. by exdeekappa June 24, 2017
Get the thats extremely nicemug. by qtties November 7, 2021
Get the nice lolmug. by imaboredchild07 April 10, 2021
Get the Nicemug. by karazan145 December 18, 2021
Get the nice beatdown retardmug. 
