Bad
intolerant - Refusing to allow others to do or believe things that you don't agree with.

When people try to dialog with others, and both are intolerant of each others' points of view, it often just degenerates into a shouting match, with neither side listening.
impressionable - Easily influenced by somebody or something, usually due to being inexperienced or naïve.

Because children tend to be very impressionable, their use of the internet should be monitored, so that they are kept away form undesirble influences.