At what times did you realize your friends weren’t true friends?

I had a couple of friends who I thought were true friends but, later down the road, they weren’t. So I cut them out. They always made snide comments about me but tried to make them come off as “jokes.” One of my friends asked why I cut contact with them but I felt she wasn’t all that concerned. And she asked me while we were at work instead of wanting to talk privately.
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Basically, she cornered me and there were customers and other employees around within earshot. And she knew it too.
At what times did you realize your friends weren’t true friends?
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