Rashford is rediscovering his best form this season while on-loan with Barcelona. And he took aim at the culture inside United for his issues over the past two years.
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But Rooney said on his personal podcast: "I think the environment hasn't been right but that is down to yourself.
"If you are not playing well or you get left out of the team then I think it is easier to blame the environment and whether that is right or wrong. I think that comes from how you apply yourself.
"In games we have seen with him where we know he can do more, we know he can run more - that is nothing to do with an environment.
"I might be wrong here, I really like Marcus as a lad and as a person but I think that is an easy one to throw at people."