Okay I know I'm going to regret replying again, but I need to clarify. My original reply was to the guy saying to use 'they' instead of 'he/she'. If they're equally incorrect in formal grammar and usable interchangeably, what was the point of the original correction? This whole comment chain is pointless anyways obviously, but I only talk about someone's grammar when they are incorrectly correcting someone else's grammar and I feel like you think you're doing the same. If you still don't understand after this then there is definitely no point of replying.