I see this claim all the time in comments about mandatory arbitration clauses, but it doesn’t make sense as stated. You need to narrow it down or at least clarify it somehow.
Being able to waive legal rights is necessary for society to function. For example, I have the legal right to not give McDonald’s $1. I waive that right in exchange for them giving me a soda. I have the legal right not to go to work every day, which I waive in exchange for a paycheck. And so on.