He never actually said "so sue me", though. He was told, probably correctly, that at his size, there's no point in getting a perfect contract that precisely covers what happens in every one in a million possibility to the satisfaction of every party. Ignore the rare possibilities of the contract and just do the work, knowing that if you hit one of those rare possibilities and violate it, then their only real recourse is to sue you, which probably costs more than it's worth. It's about being aware that you can say "so sue me" instead of worrying about covering every risk in the contract.