Just like Giyu, you've been bullied by Shinobu. She told you that you needed to get more friends and when she poked you to apparently "get closer to you" it inspired you to get friends

You started to poke someone to bring them closer, when they asked what you were doing, you were too embarrassed to respond and kept poking them. The person slapped you and when Shinobu saw she took care of the situation

"I don't think it's respectful to go on poking people. They might get the wrong idea."