Um, mine does. The DivX Plus Player plays my videos upside down, yet Windows Media Player and my videos themselves are fine. Look, I'm just taking a guess here, sorry I if I imposed.That in no way, is relevant. As the OP clearly stated, he is having the problem in a video editor. The video editor is at fault, not the videos themselves.
You are taking Shukaku's hard tone too seriously, I very much doubt his intention is to sound rude to you he rather prefers to stomp out the facts xD You proposed a theory, he explained that it's unlikely. Indeed some players may have the features to flip the playback upside-down, however such player features do not transfer over to video editor. So the chances that it's the player issue is very smallLook, I'm just taking a guess here, sorry I if I imposed.