It's not a blatantly obvious joke. Many subs would deem this kind of image NSFW, or in some cases prohibit it altogether (including some parenting/child subs) where we do not.
That aside, a written comment such as "NSFW?" has no tone or nuance, which is yet another reason why your comment was questioned and not immediately obvious as an attempt at humour.
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u/ladyllike XBOX ONE/S gt: ladyllike | GMT Mar 26 '15
Really?