I have heard people make excuses for portal healing, which include:
1. "You guys are ganging up on me!"
Diablo is a game where you fight multiple enemies at one time, you have had practice doing this during farming. A brawl is a free for all where you are expected to fight multiple enemies at once. People who go into a brawl should be prepare for this and respect it.
2. "I was attacked from behind by someone else while I was trying to finish you!"
It takes skill to attack one target while evading damage from a different opponent. Develop these skills if you choose to brawl.
3. "I am out of spirit/hate/AP!"
This is an issue that can be solved by gearing for resource regeneration or it can be avoided by not spamming skills needlessly.
3. "My wrath of the berserker (or other skill) is on cooldown!"
You would win every time if you just fought people only when wrath of the berserker was on.
4. "There is no point to this! Only duels matter!"
Its fun, it is a test of your survival skills, it makes you aware of multiple opponents, and it is practice for when the arena comes out.
5. "You are running away from me!"
Disengaging an opponent and hiding until life regenerates and cool downs are restored is a fair and acceptable practice in brawling. It takes knowledge of the area to know where to hide and when to move somewhere else while being undetected. Most importantly, I am staying in the scorched chapel when I run so you can kill me if you find me; while a portal healer is running to town where they cannot be killed. Investing in life regeneration gear is pointless if you do not hide in the map to recover health during a fight. Running to town is best choice when everything is resorted instantaneously.
Please, if you portal heal, only do it if it is cool with the other players in the game. If you are new, do you not portal heal. If someone in the game is portal healing, vote a kick.
Portal healers are in the same odious category as item dupers and the 2 beez guy. This is because they exploit flaws in the game to get ahead of others instead of developing skills. There are enough design flaws that people exploit during PvP, but portal healing should not be one of them.