He wasn't talking about you picking WW as something you did wrong. He's referring to you building flare/BoRK/Wits end instead of going something like flare/wits Randuins, SV/Banshees. While it probably would have not won this particular game with those scores, it would have been a much better build path for your team composition and in a slightly closer game may have made the difference. To be completely honest with any composition that build of yours is pretty dreadful. You only need one offensive item after flare and with your W on you have a ton of wasted gold on Aspd, and are squishy if you get locked down to boot.
edit:
Anyone who is going all caps LOLOL and talking their team down probably was talking shit during the game, or at the very least had mentally checked out during the course of it. There are of course exceptions to that rule, but it holds up pretty well generally.