If you insist on using treats you need to do it right and need to set the rules/boundaries.
Food aggression/pushiness is absolutely unacceptable - 'back up' should be firm in every horse's vocabulary!! Every horse should back up with just the word, no matter what your body language at any given time, despite what you have in your hands - Always. That's very serious as Peppy pointed out the dangers of not enforcing personal space, particularly around food.
If you want to use treats here are rules to follow. First off, he needs to do something to get the treat - and that does not include pushing you around or moosing into your space. In fact he shouldn't even touch you. Personally I've been able to teach this skill without ever having to touch my horses, though solid bum-kickings would never be spared if the horse did something to deserve it.
Here's how I did it. I stood with my pockets full of tiny treats and waited. The horse of course would mug me, knock into my space, being rude in general. I'd ignore the behavior - my horses are not aggressive and respect my space well enough just to touch/sniff/nose and not become aggressive. If they were, I would have done this from the other side of the fence so the horse could not touch me. The very second they turn their head away from me, for any reason I would click (I use a smooch so I don't need to carry a clicker around) and give the treat. The click/smooch noise marks the exact act that you're looking for - of course they don't know this yet, but they quickly figure it out :) Repeat this until the horse learns the only way to get the treat out of your hand is by standing quietly, a respectful distance away with their head turned away. When you feed the treat do it arm's length away and feed slightly behind the chin so they need to back up a bit to help reinforce the personal space issue. In the case of a colt I'd use a small bowl also to feed the treat in until they're old/mature enough to learn how to take a treat without teeth.
Next you need to teach him all the basics- how to yield to pressure and all the basics - if you need I can go into further details with that.
Next you need to remember he's a baby and his attention span is quite limited, so learn your horse's span and don't go over it or you'll be setting yourself up to fail.
Remember he's a baby and you have many wonderful years ahead of you :) Enjoy your pony! Would love cute baby pictures ^^