Partly because most the topics don't interest me, partly because I got sick of butting heads with people I like, partly because I tend to hold grudges and let arguments get to me.
Personal choice. You can't force people to like the Pub.
To explain it a bit better, for example, if a Pub topic is about current affairs, politics, etc. then I've already discussed these topics to death in real life, at work or socially, and typing things is a much more laborious medium to talk about things in great depth than say in person verbally.
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