Any advice would be appreciated!
I know it FEELS like an insult when your young toddler laughs at your discipline -- but don't take it personally. She's simply too young to "get" all the implications of what you're trying to convey. Instead, focus on showing her by experience what you expect from her -- and what will happen if she doesn't follow through. If she climbs on the table, set her down with a stern "NO". Don't worry if she seems to ignore you -- simply follow through as before -- as many times as necessary -- until she learns you won't let her climb.
The more emotional and upset you get, the LESS she will understand what you want her to do. She won't truly "understand" and respect your attempts at discipline until 4 or 5 at the earliest -- so pace yourself.