It should be obvious that people need to be careful about discussing politics online, especially when they do so under their own name. Politics is one of the most sensitive subjects around, and even a surface-level view of them would highlight the nastiness that goes behind politics. Unfortunately, this advice often goes unheeded.
That's not to say that people shouldn't discuss politics online as, after all, they play a crucial role in our own lives. There's come a point, though, where it is better to not say anything, especially if the subject is not directly relevant to an agenda than to make a fool out of oneself.
Unsubstantiated political points, be they from the left or right, can leave a bad impression on a person. More than ever, employers scour through the Internet, especially social media, to see if a person is able to function in a workplace environment where they have to deal with differing views.
If, say, a person's tweet is calling blacks derogatory terms or advocating for voters disenfranchisement among Midwestern Americans, why should an employer hire them? Tweets like these come off as bigoted towards a specific group or race and, in a society that functions as a marble cake where everything mixes together, it's unacceptable behavior.
Unless you are prepared to face opposition from those who disagree with the cause you are supporting, it is best to keep political discussions with like-minded family and friends where employers can't catch you. Of course, it should not be to the point where it acts as an echo chamber from opposing viewpoints, but at the same time, it is better to converse with a trusted group than not.
Sometimes, however, there comes a time when political views need to go out in order to support a cause. Once you decide to make that choice, it is important to research everything regarding that topic. If you have any questions regarding it, find an answer to it. Don't assume anything that you cannot prove.
Once you have done all that research and decide to post it publicly, make sure to accept that you will face disagreements, possibly even opposition. When that happens, always make sure to respond calmly and rationally. If you feel offended by what someone said, either do not respond to it or take time to think about it before giving a response.
Politics is a subject many people are passionate about and is an important aspect of forming communities. It is also one of the most controversial subjects and as such, easily subjected to misinformation. Being armed with information and checking your bias is crucial towards discussing politics rationally.
It's okay to be invested in politics, but don't let it be a setback for your goals in life.