I've met a lot of fellow mushers over the years in the US, UK, and Canada, and in all but two situations they've all been fine. This was back when meetups were pretty common and in my group of friends I was the one everyone invited over to meet their parents to show them that see, the people they talked to on the computer were perfectly normal! Honestly I have a lot of great memories from the good old days. Except for these two:
The first I went to visit someone I'd been playing with for years and he was cool and I met his girlfriend and we all hung out and had a fun time and then on the way to the airport he was like this wasn't how I thought things would go I was thinking maybe we'd end up having sex in a phone booth or something and I was like oh look I'll just get out here. Pretty sure I barely talked to him after that it so freaked me out.
The other I went with my then boyfriend to meet up with another couple we mushed with. My PC was in a romantic relationship with the guy's PC, but it's all IC so whatever. The meeting was kind of coincidental as it turned out we were all just going to be at the same event that weekend. So we get there and we meet up with them and we shake hands like normal people and the wife in the other couple goes "Handshakes?! I thought for sure with these two it would be hugging and making out!"
It was so awkward and we got out of there quick.