Did he even see that you were there? It's possible you startled him and because you startled him with what is usually a threat he decided to act first, think later. Since he had no idea what was hissing/growling at him until after he had already attacked he didn't have time to realize "oh that's my owner, she always does this, I know it doesn't mean anything from her", he just decided to err on the side of caution and defend himself without knowing whether or not it was really necessary.
So yes, in the future, refrain from hissing, growling. Try chirping or trilling instead.
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