What you're saying is true, but (sentence).
A good technique when you're debating with someone is to agree with some parts of what they've said but disagree on other points. One way to do that is with the phrase "What you're saying is true, but...."
A: The cost of attending a university these days is outrageous. Kids these days are coming out of school hundreds of thousands of dollars in debt. It doesn't seem worth it.
B: What you're saying is true, but having a degree is still necessary for getting a lot of highly-paid professional jobs.