Taking care of oneself is important. Sometimes this means setting boundaries. This is one of the places where setting boundaries is key. You do NOT have to engage in every conversation/argument, unless you want.
You can also stop midway and tap out of a conversation/argument and it doesn't mean you cannot defend your point. It means that this discourse is not as important as your maintaining your balance.
Know what you believe and discuss it with those who are open to hearing. I have yet to win someone through internet battles. I have won many through consistency.
This has been your morning wake up call.