Hello! Thank you for your question.
Honestly, this is a question that is your own opinion. Not everyone believes that you should avoid people who seem to always make the wrong decisions. Those who do choose to believe this is because, they do not want to be involved with someone who makes bad decisions. Usually when you are involved with someone who tends to make the wrong decisions, people assume you make bad decisions as well. People usually tend to say people who make bad decisions are "bad people" and when you involve yourself in with people who make bad decisions, people think you are a "bad person" as well. Some people don't care what others think about them, therefore they still hangout or involve themselves in with people who make bad decisions. Either way people will always have their own opinions about people.
I hope this helped you! Anymore questions? Just ask.