Of course it's easier said than done, especially in real life. Part of being human is being totally irrational at times, especially when driven by emotions. You're always going to end up saying things that you're immediately going to regret, and there's not much you can do about it.

The golden rule(s) are perfect in theory. It's kind of like communism, though. There's too much room for human error that it's unlikely that it will ever work out perfectly.