This has nothing to do with what distro you are using, except perhaps what termcap information it has. If vim detects that the terminal can support mouse input,

This has nothing to do with what distro you are using, except perhaps what termcap information it has. If vim detects that the terminal can support mouse input, then it will enable mouse features. If not, vim does not get control over mouse input and your terminal provides default mouse behavior (right-click paste). You can disable mouse features with the command ":set mouse -=a". If you're pasting into vim from a terminal, you may also be interested in the "set paste" command.