Yes, except it's not "like or dislike", it's almost exclusively "like". Partisan normally refers to being strongly in favour of a particular person/group/party/etc., not against one (unless the party you're supporting literally has that in their sloga, like if an Anti-Harper party... but lets not go down that road).
In context of political discussion, when you are being partisan, it 'generally' means that you are forgoing/ignoring objective facts in favour of supporting your preferred person/group/party etc. In context of this discussion, being called partisan implies you are arguing against PP not because we have an objective belief that he is a bad choice, but instead because we are are so staunchly supportive of other parties we are attacking PP regardless of objective truths.