You don't necessarily have to stay in a conversation and endure, stop, or fix every "bad" thing that is happening.
Key takeaways:
What makes stepping up to a challenging conversation stressful (besides the prospect that something unpleasant or painful may happen), is our belief that we cannot leave: we often think that we have to stay and endure, stop, or fix unwanted behavior or emotions - but we don't want to do that and/or we can't.
Do not expect of yourself to endure, stop, or fix unwanted behaviors or emotions. In many situations, you can't - and you don't have to.
Utilize the verbal equivalents of evading and redirecting: take a break, change the subject, or end the conversation.