A workplace is not the neighbohood "bar and grill," where people drop by to hang out. Most employers discourage workers coming in and hanging around a worksite when they are not "on the clock." There are very sensible reasons for that policy.

Don't listen in on conversations that you haven't been invited to participate in. That's rude to do.

Your supervisor liked you until she got tired of your intrusiveness.

They are giving you valuable feedback about what you need to change in your behavior. But you can refuse to change, if you want. It's up to you.