He was using a metaphor not actually claiming last gen users are bad at crucible.
However, to his reply stating that many people run back to last gen to do good in crucible because of the smaller player base is quite true. Take a look at she's my nerd for example. When he gets challenged on the Xbox One he runs back to the 360 so he can go through the trials without any challenge.
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Oh didn't know about that. Guess I'm not up to date with all the destiny things. Sorry if I sounded rude.