Dude... just forget about this idiot.... if you think you are bad or something like that now... trade some experiences with other bards that you know ^.^
e.g. : someone told me on 2.X that I was a Bad Summoner with the lowerest DPS on the party... I felt bad and then my friends asked me why I wasn't playing with my summoner anymore. in the end they cheered me up and my friends started training with me ( we were doing trials and trying to kill the boss as fast as we can and I gained my confidence on playing with summoner back.
so just forget about this idiot... and if you doubt about yourself you will be bad... just be confident and you will be fine ^.^