You can report them for harassment if you feel harassed, I don't really see that adding such a specific rule would be helpful, as it's not about players wanting people to do research before a fight, but rather how they react when someone does that. Saying "You are not allowed to harass a person because they do(or don't do) 'X' " Isn't needed, because you are not allowed to harass a person period regardless of the reason. That said there is a line between critique and Harassment, one that is often very subject to interpretation. If you're interpretation is that it's harassment, report it, and let it go through the GM system.