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Was it one off situation or repeated pattern? The distinction matters.

The rest of it sounds simply like arrogance. Simply said, it is quite common in software world. To me, it worked couple of times to say that "I know", but it depends on exact personalities involved. Be careful to not underestimate him just because he is arrogant and annoying.

Also, what does "act like manager" means? Is he assigning you tasks and checking time sheets? Bossing you around?

> I explained and then he was like, ok.

Awesome! Mission accomplished!

I first learned how to make a timed loop for animation in javascript in IE4 when DHTML was new. I'm sure it's a lot different now and I'd need an explanation too. Be happy he wants to know how the new way works. We used to just count to 1000 every loop iteration to slow things down...