Does playing against weaker player make you bad at chess?

No, I play worse against stronger opponents

to answer more directly though, i think it is fine to play lower rated, but probably not toooo much -- as others have observed, that may leave your mistakes unexposed. i've known people who play against lower rated players, but they play against their level too, and it seems to be fine
that said, playing against them in the way you described hardly sounds like a good idea.

not necessarily no. They are your friends it's just a game to be fair.

Playing with weaker players make u bad at chess as tou get used to weak moves and the brain forgets how to calculate accurate moves.

What is chess for if you don't play with your friends?

You really should try to play your best against any opponent. Let your friends see how the game should be played, they might learn to play better. You can give time odds to make the games more competitive.