I laugh at what he said because it was so funny.

[tufguy]

We laugh at something. Am I correct?

What should be the correct choice here "at" or "about"?

1) I laugh at what he said because it was so funny.
2) I laugh about what he said because it was so funny.

 

[emsr2d2]

We laugh at something. Am I correct?

Yes, in the context you've given below.

What should be is the correct choice here? Is it "at" or "about"?

1) I laugh at what he said because it was so funny.
2) I laugh about what he said because it was so funny.

As you correctly stated at the start of your post, "at" is the appropriate preposition here. However, there's an error with your choice of tense in both 1 and 2. Can you work out the problem?

 

[emsr2d2]

@tufguy While we wait for you to spot the error in sentences 1 and 2, I'd like to draw your attention to the fact that we can "laugh about" something but not in the context you've used.