Imitating laugh

Have you come across a situation where people using words to imitate laughing when commenting on others post whether in blogs, social networks etc? Make it worst, the subject is heavy and serious.

I admit that communicating on the web doesn't give the exact facial expression as we used to get while communicating in real world.

What I'm thinking is, those who use words to imitate laughing seems to take others' problem lightly.

Again this is because of the lack of face to face interaction when using online media. Maybe they didn't really feels like laughing at all. Who knows. But better if we can try not to 'laugh' while commenting on a serious topics.

I hope that each of us can please think first if we want to type 'haha' etc depends on the situation. If the person we're 'laughing' at doesn't take it seriously, it's OK. But what if he/she take it seriously? and make it worst we didn't even know it.