Avoid awkward topics when meet crossdressers

For someone who don't know about transgender people and crossdressers, it is not easy to start a conversation with them, because they don't know how to avoid awkward topics when chatting with transgender people and crossdressers. This is really an important problem. The first step to avoid awkward pauses is to avoid awkward topics. What are the awkward topics?
1. Personal information. This is a common sense the don't ask about other people's personal information when you meet them for the first time.
2. Topics about crossdressing and transition. Many people are curious about crossdressing or transition, so they ask many questions when chatting with crossdressers or transgender people, remember it is rude to do that.