If someone's work is poor enough that a reasonable person might laugh at it, then there's nothing wrong with that. Hence the phrase "laugh at our mistakes". It doesn't mean you are a bad coder/painter, it just means you made mistakes that were a little funny and can learn from them like anyone else.
There's a difference between laughing at your own mistakes and laughing at someone else's. People who are ridiculed for making mistakes are incentivized to hide their mistakes rather than learning from them.
