I think people feel that what I suggested was treating a serious problem with doling out unicorn kisses and 'begging'.
I am not advocating that. if a horse is genuinely aggressive, it must be addressed firmly, as firmly as the actual threat from the horse. From what the OP wrote, it did not seem to me as much an expression of true aggression so much as irritation, or possibly disinterest, maybe lack of respect.
that is why I suggest doing something that engages the interest of the horse. in fact, engaging the interest of the horse is the first thing you do with them, always. literally any time you are approaching a horse, or leading them off, you want them to be mentally engaged with you.
That's why I suggested it's possible to make a bit of a commotion, or loud noise (starting small, first) to see if the horse will engage and come around. when the head comes around, the feet go away from you. If I was making some noise to draw his attention, and he backed toward me, lining up to kick me, I'd immediately nail his behind if I could reach him without being kicked.
you can say, "why not nail his behind first?". again, I'd want to see if I couldn't draw the horse into contact with me. every time you can draw a hrose into mental engagement with you makes the next time easier to have him connect up with you. If he pushes back against that, well you have to address that, because then it can become dangerous aggression.