日本語 Japanese Ask Questions Thread 6

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Japanese - Ask questions thread
http://dis.4chan.org/read/lang/1174719097/1-40

日語 Japanese Ask Questions Thread2 質問
http://dis.4chan.org/read/lang/1206158123/1-40

日本語 Japanese Ask Questions Thread 3
http://dis.4chan.org/read/lang/1267485093/1-40

日本語 Japanese Ask Questions Thread 4
http://dis.4chan.org/read/lang/1302350850/1-40

日本語 Japanese Ask Questions Thread 5
http://dis.4chan.org/read/lang/1330050873/1-40

私はその人にデートに誘われました

Ok, so Genki has that sentence in the section on passive sentences, talking about how you can use them to describe things that happened that displeased you, but uses that, along with three others, as examples of the same sentence structure that don't involve being displeased.

So I have two questions; firstly, why use them in that sentence structure if you're not expressing a dislike of the situation? I'm guessing that the clue is in the name, and that it's simply because it's a passive act; something that 'happened' to you, but would like to clarify; secondly, could it be interpreted as a bad thing? Say, you really don't like the person, but didn't want to upset them, or they were a mate's ex and it's awkward, etc., or would saying it this way always be taken as simply something that 'happened' in the neutral?