Whoa whoa. You cant change how other people act. Im glad you're getting a "fuck it" attitude about your speech and I think its good. But dont give these people so much of your focus and attention. Just say everything you want to say and thats it. If someone is rude beyond what you're willing to deal with them give them bitch please face and go about your business. Out of all of my speaking experiences, ive only had been be intentionally rude to me maybe a handful of times. You might be misinterpreting their intentions.