I will be honest, I have had it with Square's inability to deal with the rampant botting and gil farmers so I have taken it upon myself to help myself to some fleece or diremite where one is operating. However, I will send a tell to the bot in question to test if they are a real person first. If they do not respond or display obvious bot behavior like targetting mobs not dropping what they are farming just because they came within radius then it is fair game. I am with the rest here, if you were there and did not like what they were doing, say something. Communication is key.