is this legit play, bad play or both?

So far I find that most players at the Intro player-vs-bot level focus on what is, in other games, called "farming mid," which means maximizing the number of opposing champions killed, rather than pushing toward the enemy nexus. In a match I just finished the other four were so busy farming the bot champions in the enemy base that it was left to me alone and a few minions to go up top, destroy the last two turrets outside the base, destroy the top inhibitor, then destroy one or two of the turrets around the nexus and do 75% of the damage done to the nexus before it was destroyed.

In another match, when the nexus was close to being destoryed, another player actually shouted: "NO! WAIT!"

I need to know whether the self-glorifying, careerist approach to matches is considered legitimate or not. I'll admit that I despise it and plan to start blocking hundreds of people if it continues.

Thanks for all responses.