I've had a few negative comments but I've never really let me feel paranoid or put me down... especially since the comments have been extremely petty. I prefer not to wear my kilt around large cities when I'm alone, as I normally have my headphones on or am clearing my head walking around and don't want to stand out.
On a few occasions I've managed to walk a few miles through Glasgow and receieve absolutely no comments to me personally... I wasnt sure if that meant that no one really cared or that people were talking about me, rather than to me!