Havetheyeversaidthingstoyoulike, "Youdidsurprisinglywell," or "Thatwasbetterthan I expectedfromyou," ormaybe "Youlooksomuchbetterthanyouusuallydo?" A backhandedcomplimentissomethingfakefriendsdotosubtlyputyoudownbymakingitsoundlikepraise.
It's a waytocriticizeyouwithoutbeingtooobviousaboutit.