Quilting is fun
I teach classes and label them as Beginner, Beginner+(a person who has made a quilt or two) and advanced.
Often the beginner classes have students who have never quilted and I show them how to use the rotary cutter and cut before we start to sew. The classes are longer and I spend more time with them. There is always "homework" because this is where they will be doing most of their projects.
We talk about and I show them how to do the 1/4" seam allowance. It's very important, but, when doing a beginner pattern, such as QIAD Log Cabin, I feel it's most important that the seam allowance be consistent. The blocks will be smaller, and we adapt.
Not everyone invests in a the 1/4" piecing foot right away. They usually purchase one once they see the value of it or have cash flow. It all comes with practice.
If a seam needs to be ripped, I help.
It is never appropriate to be condescending to anyone in the class because we are supposed to be having fun.