The correct answer is false.
It is false that when you use language in your social responses that is too casual, you lose the respect of your audience.
You have to learn when to use formal language and when you can use casual language. It all depends on the kind of audience you are addressing.
However, the fact that you use casual language does not make you lose the respect of your audience. It is simply that you are trying to connect with them at another level. For instance, when you are communicating with young audiences, they prefer casual language that makes you see as an open and flexible person than the kind of formal language that makes you see old or strict.