Also remember, it's his attitude that was the issue, not his physique..
The two go together. If you could throw him without difficulty, he wouldn't be inspired to tell you what you're doing "wrong:" he'd be too busy trying to avoid getting killed. If you could throw him without difficulty, you would probably also be less bothered by his remarks and could simply ignore him instead of posting here. (This is why you don't hear many complaints about small female 5th kyu shihans, even though they also exist.)