Someone mentioned in a post I was reading that it is advisable to remove the word "plz" because it is offensive. Other posts here on meta seem to suggest the same thing, but I'm not entirely sure why. Why is this word considered so offensive?
Plz is slang, especially used by an immature younger person.
Often when having a formal conversation people do not like the use of slang in the conversation.
Also, to me, someone not taking the time to write out something as simple as please feels disrespectful to me; like I was not important enough to make our conversation formal. So things like Plz discourage me from helping you, because I feel you don't care what people say, you just want the quick answer and are not willing to take the time to learn.
To say that "plz" is offensive sounds like somewhat of a stretch to me, but everyone has their own limits. In my case I do lose some of my motivation to help out with an answer or comment for mainly three reasons:
I am fully aware that SO is directed at "Professional and enthusiast" programmers, but I don't see a conflict with the community adopting a relaxed but professional culture.