Yeah, and not thinking ahead leads to a GED, which is evident from your verbiage.

And I guess I'm wrong for using logic? Whether or not I am actually boring, has no impact on the fact that adding a brake will help his knees feel better, IF, the root-cause is him lacking a brake and constantly trying to stop on his fixie... now, if it's an issue that he has across all of his bikes, or if he rides out in the country and almost never attempts braking, the solution may be different. But from how I interpret the problem, I stand by what I said.

So keep your ad hominem attacks elsewhere. OP, seriously, save your knees now. I still think adding a front-brake would be best.