It does sound like you just have a snotty friend who mostly likely hates the fact that your beer is better than his even though he has the cool kegging setup. But don't always dismiss criticism, it'll turn you into the same kind of guy. Not saying you are, just as a message to everyone who was so quick to dismiss the chance of it.
If his friend would have posted his side on here instead, everyone most likely would have said how his friend (you) won't accept common criticism and try and make his beer better, just because he was a member of the community.
We're quick to protect our own here, like a good community should be, but sometimes we can be the one who are wrong.