He's a fool coming out with what he did on social media, his hands weren't anyway near his pants, or more logically his pockets, the most believable scenario was just stretching his arms after shouting so much abuse, but that wouldn't have gone down well either no doubt.
To me it looks like he did exactly what he is been accused of, albeit very briefly, but quickly thinks better of it, and stops himself going further, hence a slight element of doubt for some, but did it all the same, he'd have been far better saying it as it was, and making a grovelling apology.