I do think that saying something to someone and expecting them to stop and give you a response is perhaps foolish, but not any sort of problem with society. Getting overly upset if they don't give you a response is taking it too far, however. I admit I haven't really spent any time watching how different people react to things like this though, so I only have my own anecdotal evidence; sometimes, while I'm on the sales floor at work, I'll spot someone with, say, a reference to something I get on their shirt (such as noticing a logo or meme from a game). Every so often, I'll give them a quick nod and say "hey, nice shirt" to them, or say something to reference it. Sometimes I get a quick response of acknowledgement, every so often we'll strike up a conversation, or sometimes I'll get ignored. I don't think it's unreasonable to expect a brief response, or to think that I might get into a lengthy conversation about it if we've both got some free time. However, I would never get upset that someone didn't hear me or didn't respond when I said something like that to them.
Back to the main point though, I admit that I don't fully understand "objectifying" something. However, without any kind of real, standard definition that doesn't constantly change depending on how someone wants to interpret a situation, I find it becomes increasingly useless to a conversation. Touching back on Bayonetta, can you say that she's being objectified? In the context of her official art, probably yes. In the context of the game's narrative between characters, she's definitely not. In the context of gameplay... maybe? Really, it seems that someone being "objectified" has become a bit of a buzzword that's code for "I don't like this character's portrayal but I don't want to give an actual reason for it". I know that's not the intent behind it, and I'm sure that there's definitely times when a character is objectified, but there's so much grey area that it becomes difficult to communicate with it.