Because those who are grouping tend to be more anti-social than those who solo.
I like interacting with everyone, not just those who are talking to me in light-blue text.
DISCLAIMER: Yes, there are always exceptions. This is just a general tendency I've noticed over the years, and yes, when I'm grouped I also tend to be more anti-social towards those outside of my group. IMO, this is not a good or bad thing, it just is.
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