Similar things are frowned on - politics, religion, outrageously inflammatory views. You'll probably find lots of conversations going on at once. Don't be overawed or put off. Many afpers are good friends in real life, and often spend large parts of meets gossiping. Just use a bit of common sense, and join less risky conversations.
People enjoy themselves at meets.
But they don't usually get so drunk that they need to be carried home, or to use their hosts' bathroom as a dumping ground for the contents of their stomach. Again, use common sense. Especially in unfamiliar towns and areas. The pub has closed. Food can often be the best part of the meet, but it's no use doing it unless other people come along.