If a Party Finder wants only people with good numbers on FFLogs they should state that in the Party Finder. Not doing so and suddenly kicking someone that joined for having bad numbers is indeed something they can be reported for. Frankly, as has been stated already, FFLogs is not condoned by Square Enix and therefore using it to judge people and exclude them for having bad numbers is a reportable offense, solely for using FFLogs as a reason. You say "git gud, problem solved", I say "griefing, report them". Simple as that.