Why do people during a nice and fluent chat simply stop and not respond, or simply log out?

I consider its a lack in education and respect and politeness.Or am I the only one in the world feeling this way?
Or is it normal part of culture in the US, as I know 90 % of people in SW are American ?

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joe438 · 61-69, M

People online will be much ruder than they would be in real life. When they get tired of the conversation they just stop, leaving the other person not knowing what hapoened. It’s wrong and I won’t do it.