Maybe you personally know parent poster but I saw nothing indicating "his president" was Donald Trump. This false dichotomy is another poison. Obama was a man, he did good and bad things, and also had no say in others.
To pretend a person is above criticism, or that these issues are 2 sided is absurd. This is an instance of what that poster (imo) is talking about.
Edit: what user jmyles is talking about. People are close to the median and also outliers. Saying you hate obama (or implying you disagree with a single policy during his administration as that post did) isn't a tacit endorsement or ballot punch for someone running in an unrelated election after he left office. That logic is very flawed
Your president's spokeswoman is going on about Obama spying on Trump through his microwave: https://www.theguardian.com/us-news/2017/mar/13/kellyanne-co...
I seem to remember email security being a key election "issue" as well.