One thing that helped me was reframing who is in control of the situation.

If you let any comment get to you it means you’re accepting that any bigot can decide to ruin your day whenever thay want, you’re giving them this power. You don’t own them an explanation, nor your time, you can be in control and choose to ignore them and be happy instead of angry.

It’s not your duty to “fix” them, and even if it was, no one changes their ideology after just one conversation, screaming through a screen is not gonna improve either people’s day.