Either have 1st/2nd/3rd team nets, or respect each other's abilities.
This is how I used to run my former clubs nets, most players were happy with it. The keen youngster who wanted to improve would every now and the ask to face the better bowlers.
I really like this thread, as this is what happened to me on Monday. I was toying with moving clubs again, and went a long to their nets, which were two lanes in a local school sports hall. After doing my spell of bowling it was my turn to bat. As always I stood out of my crease, first few balls were pitched up, which I firmly pushed back at them. After that all the first team bowlers decided that it was more fun to pepper the old man with short quick bowling, half the time the balls pitched before the mat on the stone floor. I play in the lowest level cricket in the UK, on pitches that don't bounce, and I am never going to face quick bowling, just old men like me bowling gentle away swing. In all fairness it was easy to avoid, but what good did it do me or them. If they bowled that short against batsmen in Div 1 or 2, they would be dispatched into the next field.
Just felt like a waste of my time and am I likely to go back to their nets next week?