A self-reflected sane person would see how that gesture in that context can be misinterpreted and would have avoided it in the first place. It's not like you can't express throwing your heart out only in this way.

So I guess it was deliberate. Deliberate to look like and walk like a sieg heil, only missing the quack. Maybe a provocation, but an unnecessary one and provoking with Nazi symbolism is completely unacceptable.