This is the best troll response in the internet. I know because I invented it:
Commenter X: You're so stupid. I bet you're fat and have a tiny dick. Get a life L00s3r.
Commenter Y (You): @ Commenter X
The square roots of integers, that are not perfect squares are always irrational numbers. Meaning they are numbers not expressible as a ratio of two integers. For example, √2 cannot be written exactly as m/n, where n and m are integers. Nonetheless, it is exactly the length of the diagonal of a square with side length 1.