First off, I assume you aren’t a stutterer. Thank you so much for even thinking about this. In my experience, it’s pretty rare for someone to stop and ask or care. Your head is in the right place. I’ll echo what everyone else said. It’s ok an individual basis. I personally hate it when people finish my sentences. I’m a grown ass adult. I know people are usually trying to help, but I find it off putting. Other stutterers welcome the help. We need more people like you who care enough to ask. Thank you again.