Don’t make posts telling others what to do. People have different opinions, and governing their lives with “advice” won’t help anything most of the time.
don’t live in echo chambers. Respectfully engage in contrasting opinions (unless it makes you uncomfortable) even if you don’t like the person.
Flame wars can be avoided by not responding, but you can still try to see the other side's ideas. It's called open-mindedness
It depends on:
The extremity of the topic
Whether your response is reasonable to the topic or not