Many of the haffies I've come across have been "bullies". Odd are this happens more times then you have seen, its probably nothing new to your mare. If after 9 months he is still being *aggressive* (not get way from my hay pile behavior, totally normal), then I would sell him (especially if he can be ridden!) and look for another more level headed horse. Just like people not all horses mix well together. If the two were in a herd of 20 it wouldn't make a difference, plenty of other animals to socialize with! But imagine your horse picked you a "friend" to sit with you in your bedroom all day. Just you and her, and you didn't really like each other... Yeah, you get the point. Lol.
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