How to deal with a friend like this?

I have this friend (let's call him A), and since I met him I felt a bit of arrogance whenever I talk to him. For the past years, I always ignored that feeling cuz it makes it difficult to understand your feeling towards your friends when you think about their negative stuff. Well just a couple months ago, I just had a big fight with my other friend (B) in an argument that A was not part of. I don't want to go through too much detail but I'll give a brief explanation what the argument was about. It was all about how people from Manila (Northern Philippines) dislike Cebuanos (mid-western). I responded in a very irritated way because I am from the North and felt like I'm being discriminated, so say "Why are you generalizing the people from the North when in fact both dislike each one another, we're all Filipinos!??" I should have not said that both dislike each other when I really didn't know that-that's how they think about people from the North. It never really came up to my mind, because all I know from the years living in the Phil. was we're Filipinos. Now the aftermath, it was a long argument and I've notice that "A" keeps butting in and making fun of my statements when has no clue what we were actually talking about, he's Laos and he'd only know other Filipino who he had play on his online games (which I've learned that most Filipino gamers I've met online are egoistic people). So A decided to use references from Filipino he played online with and make it sound like he knows what he's talking about. So I got a bit frustrated. After the argument, we went to our class and A and B goes in the same class but A decided to make fun of a word I frequently used in the argument "Generalize" and I still don't know how that was funny? Since I couldn't explain myself in the argument because I was being pressured by A and B's statements, and other discriminating comments, I decided to leave a long ass FB message to B to clear some stuff out. My point on that message was he was stereotyping Northern Filipinos, and how disrespectful it is to make fun of the person you're arguing with when I was trying to be mindful of what I have to say in the argument. He responded as, it was a trivial argument, we were just kidding. So I felt that the point of the argument was to pissed me off cuz they know that I wasn't comfortable arguing with them when they keep disregarding my statements. I also left a message to A cuz I felt more frustrated to what just happened. Ok I was not on level headed mood when I send this message but as much as I felt typing the message was more of an awareness for him. NOT A THREAT
"Please understand this message and respect it.
Hey, just wanna let you know that you should watch out what you say. I am almost to that point that I'm about to lose control of myself. So the moment I see you, I might beat the living sh*t out of you."
A immediately sent my message to him to B since B suddenly messaged me back about my message to A. It's funny cuz, he'd seen the message 15 mins before he replied so I'd already thought that they talked about it with each other. B seems like my message is pretty funny
A: "Sorry for offending, but yeah guess we ain't friends then LOL that thought never cross my mind so.." - this response just infuriated me! His response to my message seems like a joke, He I quote, "I was just butting in for fun, not to be an asshole really.", and I was like WHAT!!??? "Reread ur message again and tell me that is not what being an asshole mean"
Me:Stop making it seem like you have nothing to do with any of this, stop acting like you can say whatever u want when its unnecesssary. You say you dont talk $#%^ bout ur friends, take a minute to recall what u just did today.
At this point he had "Unfriend" me on fb. That just made me feel more pissed off than I ever felt.
OK so whatever happened on that part, we both come across and became friends again without even saying that we both were sorry about what happened.
Hanging with him again, I notice that he is still unaware (or forgetting my statements about him) of how he acts around me and his friends. So his parents and mine knows each other and they spend their time hanging out with each other often. A has a car (paid by his parents), goes to college (paid by his parents), a job from his mother's side family restaurant. I take the bus, I work when I get a call (yard work, computer fixing, etc), Used my Christmas and Bday money for College. Before the argument happened, I have been helping him build his PC. I spent hours reviewing the best components I can get him for a budget price PC. He also did something that started all these feels that made me think that he's a spoiled arrogant SOB. I was going to buy a gaming keyboard that I have been waiting for and he decides to buy it. All he said "Well I had the money, and we're friends right?".. Today he said "I get money from my parents, you have to work for it."

^bump