It can be hard. Especially if whatever is bothering you really makes your skin crawl. It would help if I knew a little more on why it is an issue to you.
Personally if I don't like something I either ignore it or laugh it off. The latter is really effective, I find, because it helps to lighten anger or slight annoyance. Ultimately I know I can't make people or certain circumstances change so there's no reason for me to fret about it. Getting super angry and lashing out usually never solves the problem. Anger isn't a "feel good" emotion and yelling at others would most likely make them mad, and the problem worse.
Another alternative is to simply move away from that site/page/topic and find something else to do that won't get the blood boiling.