I'm 14 and a 30 year old is gossiping about me?!?

[Emily]

Hi , I am 14 and I love bands and take about 1 selfie every week or two . I was at my cousin (who is 30 or 35ish) and I was baby sitting her kids and the one was playing on the iPad . My cousin texts in the iPad when her phone is broke and I saw my name in a text , I read the text and she was telling my other cousin that she thinks im a lesbian because all I do on Facebook is post selfies and band stuff ! It was completely irrelevant to the conversation and she randomly said it ! My cousin never responded and I have to see both of them in 2 days ! I kinda want to post something vague about it on Facebook but I am pro gay , is that bad ? I just dont know what to do !