1) You want to remove that link right now. Naming and shaming is not tolerated here.
2) With a few months of experience and a level 70 character you're not excatly "new" anymore, at least not in my book - I'll probably sound like a jerk too, but I expect someone at level 70 to know how to play
3) Not excatly normal - but we also dont know what happend here. Right now I dont want to judge over wether or not he was actually rude or just not suger coating that your dps was bad and you need to look into your class more.
4) Parsing and shaming someone for that is a reportable offense -> thats your way to go there.

Please realise though that level 70 with several months of playing means you're not new anymore and actually expected to perform well on your basic class rotations and such. If you're unsure: Please look up guides, find BLMs to ask for advice, play around with your class on a dummy or something - but stop using that excuse in a level 70 dungeon.