A Parent Speaking Lashon Hara

How should one act when a parent talks about things that happened to them and their thoughts, which include lashon hara? On one hand, interrupting their conversation every second word and saying it's lashon hara would be very humiliating and disrespectful (I tried gently to show discomfort), but on the other hand, it is forbidden to listen to lashon hara.

Shalom and blessings 

One should gently steer the conversation to another topic. 

However, if it is not possible to do so gently, one should explicitly say, 'Let's talk about something else, this is lashon hara'. 

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