I'm Legacy and I disagree.
Quite the opposite I'm happy to admit that I probably suck more than most new players that have hit 50 before me now.
I hope the future rating system based on helpfulness will somehow remedy this but I'd like people to think about the long run too.
Some of us plan to stay on these servers for years. Therefore being nice to other players is probably good for you and everyone else on the long run.
I know players in XIV might seem expendable due to the duty finder but these people are the same faces you'll bump into for many times in the future too so we might as well make the most of it =)
It's nobody's fault they're not "pro" in a game they're playing for fun. At the same time don't be so defensive in getting instructions from those more experienced than you. (if it's bad advise then just ignore it if you know better).