A few actually good answers (surprisingly good for "Hacker" News) in the comments:

Have it admit it doesn’t know instead of sounding like a Reddit thread full of “experts” trying to one up each other

Other people taking it seriously, honestly. It's hard to take it seriously when everyone is thinking it will dethrone God or put everyone out of a job and if you're not using it you are going back to the Stone Age while it embarrasses them repeatedly.

When you ask it to do you something and it tells you to fuck off and do it yourself.

I will take AI seriously when the data used for training is gathered with consent from its authors.