In other words you chose to hear that wich inflates your ego, and ignore those that tell you when you're negatively affecting their gameplay. Very symptomatic of affliction that affects you so greatly.
Actually, like Nrshida has been recently in his evaluation of me, you too are off the mark here. Ego has nothing to do with it.
Why must you assume some sort of "affliction"?
Instead, I tend to follow the golden rule "Treat others as you would want them to treat you".
If I'm in an MA 1v1, I enjoy the additional challenge of a 2nd or 3rd jumping in. The MA is all about the excitement of variety and difficulty for me. I can always follow up with dozens of 1v1s in the DA private fields if that's my idea of fun.
If the 2nd is on my side and asks first, I will answer honestly depending on the situation assuming I can talk which is often not the case. If I can't talk and unable to type, I, by default, let them decide if they want to jump in and always respect their decision. You'll never hear me complain because someone was trying to help me win a fight.
If they ask if I want help and I say "No thanks, I got it." and they then jump in anyway, I respect their decision as well since they may know something I don't, like another bad guy is coming or they need one more kill to get their diamond ace achievement, or my mic wasn't working, or i pushed the wrong mic button, etc. Again, I can always go follow up in the DA if I want private 1v1s.
There are many situations and many outcomes to an MA 1v1, but my following the golden rule and respecting the decision of others never gets me upset and very often results in great fights. Inflating my ego has no part in it...as I often lose the 2 or 3 v1s.
You can't always assume somebody can talk (they may be unable), or listen (they may be unable), so use your best judgement. Sometimes you'll be wrong, but most often you'll make the right decision.
Consider the golden rule to help in these matters.