By the end of chapter two in Steinbeck's Of Mice and Men, George does appear to be a good friend to Lennie.
George can be a bit pushy and insulting at times, like when he gets terse with Lennie about not having any ketchup, but for the most part he takes care of Lennie. Most of George's shortcomings in his conversations with Lennie are just the result of a lack of patience. He probably doesn't speak any more harshly that most people would in dealing with Lennie.
And George is careful to take care of Lennie. He brings beans for their meal the first night, makes Lennie give up the dead mouse, brags about what a good worker he is, protects him from aggressive people like Curly, and asks Slim about getting a puppy for him.
The novel's society has no place for someone like Lennie. George does his best to give Lennie a place.