None of that is punishable, unless you spam it or use a quote you use is unacceptable (like directly saying that you're going to kill someone). Remember, Solid Snake is a fictional character with dialogue that is suited for his role in that world and it's aimed towards other fictional characters. You are a human that is typing to other people.
Unfortunately, killing is one of those things that gets easier the more you do it.
This is a good quote, use it when you're really fed.
It’s only when I’m cheating death on the battlefield. The only time I feel truly alive.
Good after an escape.
Vengeance is only a step behind you.
Good after you didn't escape.