1.It's not being an asshole for helping someone. It's being an asshole for pointing out his mistake 3 times. If you point out their mistake once, as long as you don't make it sound like "You should have done this and not this", but once you point it out two or more times then it starts to make you look like an asshole, even if you aren't. If he had not responded to your comment, it would have been okay to say it again, just to make sure that he saw. But you said it 3 times, which is more than enough and starts to make you look rude, and to make it worse he acknowledged that you had said that in your first comment AND he apologised! His words:
"its the comma button that's why I put ,
Sorry I thought u would understand"
2. Just because someone is Buddhist does not mean that there is a 0% chance of them being an asshole. Your religion doesn't guarantee you not to be an asshole. I bet there are at least some Buddhists who are assholes. I'm not discriminating, because I, as a Christian, know that there are at least some Christians who are assholes.
3. " "press the , button" is really helpful information because you make it totally clear which one, there are just over 100 in most cases." This sarcasm doesn't really help your 'friendly advice' argument. (BTW I fixed your spelling and grammar mistakes and made your citation more accurate)
4. Not everybody can see this 'fact' (More advice than a fact). If everybody could, he would have put the ' ' around the comma.
5. Those are not neutral words. Because I am nice, I will change what you said so they would be 'neutral words':
Just some advice: 'Press the , button' isn't really helpful, because some people might interpret the ',' as a break in the sentence, and not 'the ',' key'. Try to put quotation marks around the comma like this, "," , so that people understand that you meant the comma key.