Is a high bounce rate bad?

It depends on the type of page. For an informational page (a blog, for instance) having a bounce rate in the 70-85% range isn’t bad. The searcher is coming to your page to get information. Once they get it, they are done with that page.

If it’s a transactional page, having a high bounce rate is bad. Those are pages you want someone to take an action on. If they are leaving that page without taking an action, it’s time to audit and optimize that page to make it more useful. The ideal bounce rate on these pages should be in the 40-50% range.