Birddie, there are gallery trolls who post cruel things out of spite. They don't pick on anyone in particular; they don't know anyone here, and just flame whatever they come across. They probably never set foot in these forums, so they won't see your message here.

If your gallery gets trolled, IM a mod and ask them to delete the offensive post. (Yes, trolls get banned, but they just change their nicks and come back.)

If, OTOH, you got constructive criticism and don't want any, disallow comments when you upload. Or post in the beginners' gallery, where people will take your inexperience into account.