flounceblocker
A person who leaves a server or game, or blocks a user immediately after delivering their final insult online, often engages in such behavior due to intimidation or pettiness, especially if they anticipate a response to their insult. This typically occurs during unplanned arguments or disputes. When someone behaves this way, it is commonly perceived as an automatic concession in the argument. It is advisable to be cautious when considering friendships with individuals who exhibit this behavior, as they may not be reliable in offering support or standing up for you.
Don't waste your time arguing with that guy! he's a total flounceblocker and will just block you once he's said his piece