I remember that only one person getting upset using /check.

I was a Red Mage and I was rather puzzled because I was admiring his gear.

So so I went around the corner casted Invisible and Sneak and continued to examine him. I could tell he was trying to find me. It was quite funny. Still never understood why people would get upset.
I can appreciate RPing, but people that take it personal are just weird. It's a virtual bunch of pixels.