When we went out he was very ugly
Did something happen between the two of you?
I had a bad experience with him on a camping trip during summer break.
Regardless of what happened between you two, you shouldn't be calling people ugly. Other folks won't think he's ugly and it's quite hurtful to be called ugly by anyone.
You are being very serious about an internet chat.
Calling someone ugly is a very serious thing, even on the internet. Just because its words on a screen doesn't mean it doesn't hurt to read. You should consider how people would feel reading insults directed to them online.