Quoting Etiquette. What annoys you more?

[Karen]

To everyone - editing someone's text that you quote is completely verboten - forbidden. Completely and utterly. Taking simple sentences out of context can also be misleading and rude.

so does this mean we are suppoed to use the whole quote and NOT edit it? sorry I am just not sure...

and speaking of quotes...what am I doing wrong? why do my posts have the "quote" word but others seem to have their quotes in a box in their posts??

No, that means that you cannot use a quote but change its contents - like quoting something that says "then I heard Mr Smith say" and changing it
to be "then I heard Mr Poopyhead say"

do you understand?

It is certainly fine to quote just one sentence, if that is what you are responding to. In fact that's the best thing to do in many circumstances.