I have two step children. One I am really fond of.
However the other, I really, really struggle to like 
It sounds awful and I feel awful about it but I just find him so difficult to be around.
They are so different, I find one of them a genuine joy to be around.
But the other is very loud, shouts a lot, is the naughtiest out of the two and, in the interest of trying to be as honest as possible, I just find him very irritating to be around. He whinges all the time about everything and cries whenever he's asked to do something. He's always shouting at his sibling or lashing out at them when he doesn't get his own way. He can also be rude (to everyone).
I don't want to feel like this and I try doubly hard to make an effort with him to try and get past this but I've just had enough tonight. I found myself internally rolling my eyes earlier at another tantrum over the smallest thing.
Is it normal to feel like this though and can it change?