I have never had to deal with negative people (just negative monkeys
). I do have a thought though, about two or three years ago I started learning harmless magic, I loved it, too much. All my spare time I took to learn more, I hardly ever spent time with my family except for at dinner and then one day my father talked to me about how much time I spent doing it and his opinion on me learning magic. So I quit. Now I have so much more time with my family! This is just a rough example but what I'm trying to get at is that we don't have to quit writing but if some (such as a parent or sibling or friend) talks negatively about how much time your writing, it might be a good idea to slow down and spend time with people while you still can.
Sorry, I think I took this quote for a spin!
Sometimes, if it's your family, like, you can't really avoid them, though. I think the best solution would be just to avoid talking about it with them a lot. 
My family are very supportive of my writing, everyone in their own way, and most of my friends are too, even those who aren't writers themselves.