How do you handle topic changers?

It's very common. People tend to get derailed. Sometimes it happens naturally and unknowingly but there are times some people do it with an intention as they are not interested in it or just want to overlook it. You will have to bring everyone's attention and then discuss it.

It happens quite often. Of course, every response and comment counts towards your earnings, no matter whether it's on topic or not. If I'm nit too worried about it, I'll usually let it take its course but if I felt that the discussion was getting too out of hand, I would use my privilege as the OP to delete those responses and comments which I felt were leading the discussion off topic, (though I might wait an hour or so until the earnings had updated!). I have only used that solution once or twice in all the years I've been here.

I just leave in disgust I do not like people that hog the whole entire gathering

I hate it when that happens. I usually just go along with it because it becomes difficult to sort of go backwards.

I have met many topic changers in my life. Normally, they do not bother me at all. We need these people to keep the conversation alive. :)

This does happen a lot on myLot, you start a discussion on one thing and end up chatting about something completely different. Perhaps you could write another discussion on the original subject but word it differently.

Maybe they were not interested in such topics. So it's better not to discuss such things with those who are not interested.