<p>neither of you didn’t really do anything wrong.
I say, blame the internet</p>
<p>When you write online, things can sound offensive when you didn’t mean to cuz you can’t hear the tone of the person (I had some experiences of such cases myself)
Just be as polite as possible online (that’s what i learned).
It’s very easy to offend people online.</p>
<p>From what I read, “Because that was totally relevant to my question…” doesn’t necessarily mean to offend anyone. It does sound offensive. But I can see that it probably isn’t on purpose. (cuz i’ve done something like that online by mistake once.) If i was in his shoes and got an angry response when it wasn’t meant to offend anybody, i wouldn’t be happy myself.</p>
<p>So, my answer is: just chill out.</p>