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Are そういう and そんな completely interchangeable? Is there any difference in nuance
or meaning, or contexts where one is more appropriate than the other?
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question
grammar
Difference between そういう and そんな
Most of the time they are interchangeable because their meanings are almost
identical. The only notable difference is that in cases where the speaker is
expressing negative feelings and wants to emphasize them, 「そんな」 is more
appropriate, because it is more emphatic than 「そういう」. For example:

「そんなダメな人は気にしないで！」

「そんなことはない！」

In those sentences, if you replaced そんな with そういう, they would be less
emphatic. Of course, sometimes this might not be true because you can make
them sound aggressive purely through intonation, however, it wouldn't "ring"
the same.
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answer
I don't think the accepted answer is accurate, so I am writing a separate
answer to address some differences I see between the two phrases.

There is an excellent answer that discusses [「そういう + Person
」](https://japanese.stackexchange.com/a/23477/30454). Per that answer, there
are contexts where you can use either そういう or そんな. And this usage occurs in
both positive and negative situations. For details see #2 and 3 in that
answer.

But I think the statement that the accepted answer makes — "Most of the time
they are interchangeable" — is inaccurate and too sweeping. Here are some
situations and usages where you see the two phrases diverge if not completely
differ.

### #1

When in a conversation one party, let's say A, says something and the other
party wants to characterize A using the things A said or the way A said those
things, you can only use そういう, and in this case, そういう means something to the
effect of "you, who is saying this and that." This usage is discussed in the
aforementioned answer (usage #1), but the example given seems a bit extreme,
so I am going to give some more moderate examples:

> A: だから、言ったじゃん！ちゃんと勉強しとけって。
>
> B: うるせえな！そういうお前はどうだったんだよ！(Huh? You are telling me that? What about you? How
> did you do in the exam?)

I added 「うるせえな！」 to make B sound a little miffed, but one doesn't need to be
angry to use 「そういうお前/あなた」. It could just be a joyful retort, poking fun at the
other party and the irony of the situation. "Hey! _You_ are telling me that?
What about yourself?" In some contexts, it could even be as simple as a "What
about you?"

> A: いい年して彼女もいないの？！(You are not young. You still don't have a girlfriend?!)
>
> B: そういうお前はどうなんだ？(Huh? What about you? implication: you yourself don't have a
> partner/lover either, so it is ironic for you to say something like that to
> me)

You can't use そんな in these contexts, because いう in this そういう is more literal
than general, and comes from 言う.

### #2

Another situation where the two phrases are different is with the common
phrases [そういうことで/そういうことだから/そういうわけで/そういうわけだから (see this
answer)](https://japanese.stackexchange.com/a/23991/30454). If you substitute
そんな for そういう in these phrases, the meaning changes and the phrase no longer
serves the same purpose of wrapping up. そんなこと has more of a negative undertone
than そういうこと. 「そんなことで怒る？」

### #3

Here is another one:
[そんいうことだ](https://japanese.stackexchange.com/a/78528/30454)

### #4

「そんな！」 as an exclamation cannot be replaced with 「そういう」

[そんな used in disbelief](https://japanese.stackexchange.com/q/38430/30454)

### #5

Utterances that call for 「そんなに」 and 「そんな」 with に dropped also don't work with
そういう.

> あの店のラーメン、そんなうまいの？

Here, you can't use そういう, at least not without changing the meaning of the
sentence.
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answer