Appropriate Cosplay

Always being interested in Japan and it's media, there is something that I've noticed has become more and more widely acceptable in the States-cosplay. I personally have only cosplayed once for my dance group
 (Sailor Neptune as shown here. SeraMyu/ Manga inspired) and it's certainly fine when you go to specific Cons or meet-ups, but lately I've been seeing more and more people dressing up (or making plans to dress up) in a larger variety of places and thus leads me to the question- when does it start being inappropriate?

One such location was the cherry blossom festival I recently attended. This year they actually held a contest simply because of the overwhelming amount of people that showed up in costume, but it wasn't this way in previous years. I know that Sakura (cherry blossoms) are considered to be staple imagery in Anime and Manga but does that automatically make a site for Hanami a place to show up in Pokemon garb? I've also seen cosplay in Japanese super markets (it's a supermarket people!!), Sushi restaurants (oh yeah...), China Town in NYC (just because it's Asian guys...) and recently the one that takes the cake: people planning to go to Japan in order to cosplay in front of real life locations from Anime (Tokyo tower, Hikawa Shrine etc.). I mean, going to a store is one thing, going to a shrine and dressing up as a Miko Priestess while OTHER Miko are present? I feel that's just plain disrespectful.

How about you guys? Do you think there is such a thing as an inappropriate place to cosplay?