26.Debating does not equal an argument to an ENTP. Perhaps you are perceiving it that way.
However, if he is getting personal, then he is likely just an immature person instead of only exhibiting ENTP characteristics. ENTPs like to argue, yes, but the mature ones know their limits and how to stay within them. Its his issue, not the issue of ENTPs at large.
I used to personally critique someone during the course of discussion when my Ne caused me to see some flaw in a person's thoughts or personality that did or would affect their lives. Usually I was trying to help that person. Eventually I realized, and most other ENTPs do at some point too, that it doesn't work and the argument is not worth it. He seems to have not developed Fe yet. How old is he?
When I am excited about something I am thinking, I can have a tendency to start talking faster, raising my voice, and trying to get everything out that is running through my mind at once even if it means interrupting others, and it often comes off to people as me being upset. Perhaps that is happening too.