<human>: So I was playing Runescape with a couple of friends on skype. We just started playing so we came up with the brilliant idea of inviting a guy from our class to the RS chat. He is basically an outsider in the class and barely anyone talks to him but he has 99 on every skill so we thought it could be fun to invite him. He also stutters which is important for the later part of this story.

So we're playing and a bunch of my friends are making fun of his stutters in the Skype call we are having and I just thought it was kind of shitty behavior. But we are not saying anything bad to him in the RS chat.

Later, we meet this Dutch dude who we talk to and the guy who stutters hasn't said anything for like an hour at this point. So, because the topic in the skype call has been about stuttering for a long time I jokeingly ask the Dutch dude, in the same RS chat, if he stutters. Suddenly, I realise the dude who stutters is still in the chat.

Fuck.

So now I feel like a total douchebag and I'll have to talk to him on monday and apologize.

Can you succinctly summarize the text in 1-3 sentences?
<bot>: I made a joke about people who stutter while a dude from my class who stutter was in the same chat.