Lately I see a lot of comments from less experienced users (and some more experienced ones too) pointing out that questions about other OS etc are off topic and rightly so, they are.
However, we should still aim to leave a good impression and help the users as much as we can.
I see comments like
"This is off topic on Ask Ubuntu"
"We don't support that OS"
While these comments are not exactly rude or anything, they also do not help people find the correct site to ask on.
I would ask that users append their comments with a link to the correct site to ask on, as this is still useful information for people and leaves a good impression too.
I am not saying do something fancy but just
"This is off topic on Ask Ubuntu, but you can ask at: http://unix.stackexchange.com "
or whatever site is the correct one.
It is a small thing but I believe it make a big difference to peoples opinions of this community.