How to leave a friend

So I’ve been friends with this person and some members of their friend group for about 6 years. We hadn’t talked for a long time but we recently started talking again but they seem different from what I remember. Either I never cared about and/or noticed how toxic they were and that a lot of things they say are things I don’t like or they’ve significantly changed from how I knew them and I’m not really comfortable being around them anymore, plus a lot of their new (or at least new to me) friends act the same way as they do.

I am nearly certain trying to talk to this person about these issues will result in no changes but I also don’t want to leave without saying anything because I know from experience how much that hurts so I’m unsure what to do and would really appreciate any opinions and/or suggestions.