FF14 is not made for hardcore players.

[DPZ2]

And as this is a cooperative game, your performance does matter as it impacts other players. They have just as much a right to voice their opinions as you.

There is a difference between 'opinion', 'critique' and 'offering advice'. The problem is that some appear to assume opinion = advice.

I assume you are talking specifically about the forums themselves, where opinions are well within bounds.

Give 'opinions' of play style to another player in-game and yes, you've crossed a boundary line.