For starters, Liberals are less violent, desire stability and an uplifting progression in social values, and tend to be fairly comfortable in themselves.
Other than that - when Liberals go far enough left, they become Socialists, and start to hate Liberals for their Capitalist elements and “economic liberalism”/neoliberalism.
When conservatives go far right, they turn into fascist conservatives… Conservatives, just more staunch, violent, and unreasonable.