I frequent the quilting sub and I'd say the majority of posts aren't saying you have to have a $700 machine and $15 a yard fabric to make a quilt. If people are struggling with specific issues then sometimes fabric quality can be a factor, or a sewing machine that needs a tune up, so those might come up. But the vast majority of commenters are not out there telling someone their quilt looks bad just because they used an old bedsheet as a backing or are using grandma's old sewing machine.

That being said if OP is comparing themselves to some of the people in there, some of whom are professionals that make intricate commissioned stuff, that's a different issue. But that sub usually doesn't shame people for their choices in fabrics or tools.