Dumb stupid freaking piece of shit MacOSX when networking with Windows 7

The more I use Mac OSX, the more I find it a stupid piece of shit OS when dealing with networking Windows 7 machine.  Just a while ago I was moving a directly from the MacMini to a Windows 7 shared folder.  The folders were already there in the destination, and I am so used to that when copying files to a destination that has the folder already exist, the OS should be smart enough to MERGE the content.  Well, it turns out that son of the bitch OS REPLACED the content of those folder.

So I lost everything I originally have in those folder.

Luckily, those are not critical items, and I can always redownload again.  But that really is shitty.