David Foster -- I Know The Weeknd ... He's NOT into Coke (VIDEO)

David Foster has no concern that his stepdaughter Bella Hadid is dating the guy who sings the praises of cocaine ... quite the opposite, David thinks The Weeknd is awesome.

We got the music mogul at LAX Monday and he was so interesting ... challenging our photog who thinks singers who sing about coke must be partaking.

David says The Weeknd could be the biggest talent in memory, and he loves the guy.