If you're going to keep treating someone who never did anything to you as an enemy or something lower than you, don't be surprised when they will grow a certain dislike for you. You did that all on your own.
If someone is constantly rude to me when I did nothing wrong to them, eventually I will tell them to fuck off. The funny thing is, when these people act like I'm the rude one. So, you're disrespectful to me every time we have any contact and I'm supposed to be respectful to you 24/7 or I'm the bitch? Wouldn't that be nice. I'm not inclined to be nice to someone who isn't. People will be treated accordingly to their behaviour where I am concerned.