stick to your morals in the end, but if someone did a good job at work, you should say ‘good job on that report’ to be nice, instead of turning up your nose at them because they’re kind of a jerk. you wouldn’t want that planting a bitter seed inside you and it slowly grows until you’re grumpy and don’t know why. some people will overlook things because the person can make them laugh or help them in times of need. i wouldn’t try to be buddy-buddy with the guy, but at least be civil. best of luck to you.