Getting angry when people disagree with you is a sign of belief insecurity. But I used to feel the same way so I'm not condemning it, I think it's pretty normal when you're young and some people never grow out of it.
I was extremely idealistic from age 18 through the first half of my twenties, basically my first mushroom trip changed my life. I was on a crusade to spread my knowledge and realizations. I was into the 2012 stuff (not in 2012, but peaking around 2006). I would lecture people on what was correct and what was incorrect. Looking back I miss that time, but I also feel kinda silly for some of the ways I came across. These days, I still believe we are all one, that we are all the universe experiencing itself. However I don't claim it to be anything more than belief. I used to believe that humans can fix ourselves, now I'm not so sure. I do believe that each of us can do all we can to surround ourselves with people who support us and we can all make our local worlds better than the world at large. I live very much on the Earth, which is a difference from when I was younger, where I was almost trying to transcend myself. Whereas now I believe the point of this life we're experiencing is to experience this life. If we continue beyond that (I'm not convinced, I think we are the universe so everything happening to all life is happening in one eternal moment and that when we as humans die, we cease to exist as that particular individual, but if I have experiences that suggest otherwise in the future I'm open to revising that belief), there will be plenty of time to experience that. I strongly do not believe we are supposed to try to transcend our egos... our ego is simply our sense of subjective self, yes it may be an illusion but it's what it means to live as a human, it makes no sense to try to transcend it entirely.
Life has made me a little more cynical with regards to my fellow man, but I'm happy and well-adjusted and my life is very good. I very much enjoy the little things, just breathing and taking in nature, listening to or playing music, conversing with friends, snuggling with my love or my cats. That's what life is, is the moment, the now.