Well, like I say, in the original 1985, the person who gave him the advice that you can accomplish anything was Doc, not his parents.
Look around the table when they're eating dinner, Lorraine is drinking heavily and is criticising Marty for having a girlfriend that *shock horror* tried to call him on the telephone. George is a wimp, who has been doing Biff's work for years, and apparently cares more about laughing at some 30-year old TV show than what his family is saying or doing.
Maybe his parents didn't know about Doc Brown. They don't strike me as the best parents in the world. Marty hadn't told them he was going away for the weekend, it's not a massive stretch to assume that he hadn't told them about Doc either. Remember early in the movie, he goes to Doc's laboratory when he's supposed to be on his way to school. Maybe his parents didn't pay that much attention to what he was doing.
We never really know much about Marty and Doc's relationship before the events of this film. Some speculate that Marty answered an advertisement that Doc put out wanting a lab assistant. Maybe, as far as his parents know, he's just doing odd jobs for a local scientist. In the 1980s people weren't as suspicious as they might be nowadays of an elderly man being friends with a teenager. So, they could've just left it alone.
The only person who really calls him on his relationship with Doc was Strickland, and by his manner, we understand that Strickland isn't necessarily somebody whose opinion we should be taking seriously. Strickland told Marty that his father was a loser and told him not to bother auditioning for the band, because he was already sure he would fail. This was far too harsh a way to talk to somebody who you were meant to be disciplining for being late. Audiences weren't meant to take this warning about Doc seriously, but it did introduce the idea of Doc being an eccentric local scientist.
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