Saying the quality of your argumentation is not up to the standard of the person in question is not a personal insult. People can make mistakes and you can too. Pointing them out is not an insult, it is an opportunity for you to improve.
I didn't say it was a personal insult. I said it was an insult. And by the way, insulting without giving a reason why is exactly what my comment said it was: not an argument, just an insult. I can't believe I'm actually writing this to someone who ostensibly is an adult.