People who use words they don't mean. For instance, "he was literally on fire". No he bloody wasn't
Also, those who, in a conversation, say "Well I turned round and did this, then he turned round and did that". Basically you get a mental image of people arguing while spinning around. They do NOT turn round and say anything, you stand still.
People who sell kiss-and-tell stories. Have you got no shame? No tact?