Jeanne believes that right-handed people are better at playing tennis than left-handed people. When she engages in an argument with her friend, she ignores any evidence that supports the fact that left-handed people are equally good at playing tennis. Jeanne only gathers evidence about her beliefs and tries only to support her perspective. This is an example of

confirmation bias

Explanation:

Confirmation bias is the likelihood of people to be in favour of those beliefs that are a confirmation to what they already believe in. People that have this type of bias would interpret evidences to agree with what they already believe in and they will reject any new information that does not align with their belief.

Jeanne clearly has this bias. We can see that she purposely ignores evidences that are not in line with what she agrees to and only gathers those evidences she supports.