And no, my pony no longer mugs me or invades my space because treats don't come from my hands.
It might be hard for some people to understand, but not every single horse responds to the same things the same way. I happen to have a pony that is constantly trying to assert her dominance and uses any opportunity to feel like she is the one in control. Treats simply do not work for her at this particular stage in her training. Maybe at some point in the future I will reintroduce them, but right now she just interprets getting one with getting her way, not with having done something for me in particular.