You know that old wisdom: "if you can't say anything nice don't say anything at all"?
My mother always told me, "If you can't say anything nice, say this little speech."
Although the question was not particularly consequential, you didn't have to answer it. Instead, you answered a question about Renaissance by saying "I checked the Empires rulebook for you", which doesn't even make sense, and the "for you" just makes it slightly rude.
It turns out that ignoring someone's question is also rude.
The question didn't say "hey Donald X." but was implicitly directed at me. Hey, I'm here, I don't need to act like, why are you bothering the game designer. I have long established that when people say "hey tell me this about the new set" I will say something like "the blurb doesn't seem to answer that." Those questions get answered when the rulebook is posted, and it hasn't been. This question had an answer separate from Renaissance, so I gave that answer. He could have dug up that answer himself, so yes, "for you." I did in fact go look in the rulebook to see what it said; I wouldn't have otherwise, and he could have done that himself.
Recently on the forums I saw some posts back and forth where you kept using "your mom" insults. Being the creator of the game we all love gives you status. We're the customers. You should use your status to take the higher ground and set an example for everyone else.
If I am saying a "your mom" joke, it's to be hilarious, not to actually insult anybody. I do not see how you can actually insult someone with a "your mom" joke in 2018.
I am always going to be that rude guy. I have no ability to put on some fake persona for you. If it ever seems like a real problem I can just not post in the forums.