Apples and oranges.
On one side of the coin, I can understand their perspective that using a different font from everyone else is a form of attention-seeking and should probably be discouraged simply because it's an exercise that strengthens ego and reinforces individuality.
On the other side of the coin I can understand and appreciate your perspective. You shouldn't be expected to express yourself along a narrowly confined set of rules and we shouldn't be allowed to enforce our own personal opinion of what aesthetic design should be used when conveying information.
Just like anything else, this is a subject that only really matters if someone minds first.