It would help a lot if you had support networks to nudge you in the right direction. For me it's often as simple as asking "why do you even care about this?" or "why is this so important to you?". And that realization and consideration can often snap people out.
As someone who participates a lot in online discussions, sometimes people get into really unproductive discourse which keeps going around in circles, so I think it's useful to have norms around refocusing the conversation and reminding people of their core values.
It's also useful to give yourself a limit to how deeply you're willing to engage on certain topics with Internet strangers, especially if you don't see the conversation going anywhere productive or meaningful after a while. The ability to walk away is a superpower. When you achieve enlightenment you gain the ability to let people be wrong on the internet without it bothering you.