Aisha, May Allah be pleased with her had never given a public lecture to men though she could have because she is the mother of all believers. Men giving lectures to women is permissible but not the other way around.

How come hazrat aisha ra.. used to do dawah to men & women both…??..

Inviting others to Islam | November 11, 2014 2:35 pm
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I was giving dawah to someone proving the existence of Allah and I told them everything has a cause, and that something can’t come from nothing. He responded that particles emerge from the quantum vacuum out of nothing. I didn’t know what to say. How can we refute this particular issue, so I can respond to him next time I see him?
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Our teacher was talking about fundraising by selling roses which students can give to the opposite sex. I said to my Arab friends, “Hada ma halal.” When she noticed us laughing, she asked me what I had said. I told her. She started mocking me and all the kuffar laughed. Have I done the correct thing or should I stop talking so much about Islam and decrease my dawah?