Is it normal to gossip?

I have a friend who likes gossiping about her friends. We are pretty close and I generally like her, but sometimes her gossiping makes me feel pressured. When we hang out, she sometimes tells me something her friend does that annoy her. And I don't think she is very tolerant of people having different livestyles/opinions even if it is a small thing in my opinion.

For example, she told me that the toilet in one of our commen friends' dorm was not clean, and she couldn't believe someone would choose to not clean their toilet. I said that it was their own choice and asked her if she would feel the same way if it was a public toilet. She said no and said it was gross.

Another instance is that she told me she doesn't like people posting too frequently on social media about their lives. She was referring to posts with carefully drafted comments and edited photos. I asked her why, and she said seeing others posting about their success made her feel pressured about her own life. She then showed me a bunch of people's social media that she doesn't like.

When she gossips, I don't know what I should say. Should I just shut up and listen even when I disagree? Or am I being so intolerant of gossips?