Oxford dictionary defines "bully" (a verb) as:

seek to harm, intimidate, or coerce (someone perceived as vulnerable).

So you weren't bullied. Even if your perception that two women were looking at your body in a rude way was correct, it still did not rise to the level of bullying, and fat-shaming, while reprehensible, is not bullying. You were not intimidated or coerced. You felt that the petite woman wanted to receive congratulations on her being petite at your expense, which was understandably unpleasant to you, but it still wasn't bullying. It was nowhere near bullying.