Things to think about before you call someone "Bad"

[Penthea]

Yes you are correct, there is no right way to handle this.

There is a right way. You can tell someone they're underperforming without being rude about it. There is a massive difference between "sorry we have to kick you, your dps is too low" and "l2p noob dps".

If a person can't handle any criticism even when it's politely given then that's something they need to address. Not the people dishing out the criticism. Just because you don't like what someone said doesn't mean what they said was wrong or unprovoked.

But all I wanted was to point out why people sometimes become toxic over a friendly advice with good intentions: Pointing with the finger at them in front of other people can be enough for that.

Unfortunately without being able to send tells in instances the only way to inform someone as to why they're getting kicked is to say it in front of everyone. Some hate getting kicked silently, some hate being publicly criticised...you can't please everyone. The best you can do is be polite.