No. Thats not what they said at all, you can choose to infer meaning, or actually read what they wrote. Which was that it is NO excuse for cheating. Their entire post was obviously centered around OP not feeling inadequate or lacking. It was clear it was put in as a possible reason for this man cheating, reasons are not excuses. And the man is still absolutely at fault. It was important to say this because many people in OPs shoes would feel like they where part of the problem or feel insecure.

Just depends on your definition of sport. Do you have the same problem with people being called a "bad sport" some people use sport as "game or competition. Just as in the previous mentioned phrase you could say "you have a bad attitude when you lose". To be clear I am not saying it is or isn't, just noting why this argument always creeps up with less physical competition. I prefer keeping words defined clearly and believe sport should mean competition with physical prowess involved.