I understand your point. I use plastic too.
What I teach my children is that before they can live a reality, they have to be able to imagine it.
Are there other solutions to your glasses, toothbrushes and mattresses? Yes. Are they affordable? Not for most people.
We can simultaneously use what is available to us in the now, and imagine-think-suggest on improvements. The only way to improve is to know we can.
So yes. I use plastic. Yes, I know there are better solutions. Yes, I aim for those better solutions.
It took many years for plastic to become the problem it is today, it will take even more years to find the solution. But we will only find it if we realize there is a solution to be had.
And yes. I hope that the solution is less toxic. If the solution is more toxic than it is not a solution at all.