So I've come to learn that something + だね means something along the lines of "Is it __?" with an expected yes answer. I received this kind of comment as a response to a photo I posted on the internet. What are some common/friendly ways to respond to this?
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I think ね is sort of rhetorical, and I'd only answer it if I was talking to someone in person. Even then, the answer would probably be something perfunctory like そうだ, just to feign attentiveness ;)
I could be wrong; I learned this from Tae Kim, so you can check out that reference and see if it helps. Also, the example sentences at Tangorin and Jim Breen's WWWJDIC come off as making it sound rhetorical/for flavor, in the same category as よ and ざ.
I think it would depend on the context. For example, if someone commented to my photo:
then I would respond:
If someone commented:
then I would respond like:
If someone said:
then I would say
You're right about the expected "yes" answer. 「何々だね。」 is a rhetorical question, and a full answer is not expected. ね is a sentence ending particle that changes a statement into a rhetorical question. だ is the casual copula used with nouns or な-adjectives.
The asker is usually mentioning something they think (subjectively) and they expect you to agree with their thoughts. Answering with 「あっ、そう。」or 「うん、そう。」 or even simply 「そう。」 would work as a general answer.
It is also common to respond by repeating the statement asked. For example:
Ａさん：今日は寒いね？ (Today is cold, isn't it?)
Ｂさん：うん、寒い。(Yes, it is cold.)
Unfortunately I don't have enough rep to comment, so I attempted a full answer. This answer comes from my limited experience, so please correct me if I am wrong.
For a male speaker, if you're in a casual setting and just want to agree and keep the conversation going: だよなぁ〜。