Hahaha, Please don't fret...If an animal hissing at you means you are an abuser, then throw me in jail!
If your Hammie is hissing at you when you pick him up, try going back a few steps with taming. Even if he's already tame see if you can maybe regain some trust with him!
But him hissing could of been caused by a number of things, someone/you/something startling him, he was disturbed or he was just scared!....Or he's a grumpy butt...All are possible, haha! Don't fret and have patience!
Thanks for the help