AITA for proving I was right in an Argument with my mother?

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The original was posted on /r/amitheasshole by /u/RubyRedFoxyEyes on 2023-07-27 12:55:09+00:00.

My family and I were visiting relatives. My sister (6y/o) and I have been playing with my cousin (8m/o) when our mother joined us. We played for a while. Then my mother fetched herself a glass of water to drink. My little sis saw this and asked if she could also get something to drink. I was in the motion of standing up to get her her water bottle and said “I’ll bring you your bottle”. But she stopped me and told me that she wanted to drink water out of a glass. I answered “ok, sure. I’ll go get it.”It was my mother who stopped me this time and gave my sister her glass instead. Saying there is no need to dirty more dishes than necessary. Then I randomly remembered that my mom has lip Herpes. When I was a child my mother would occasionally get these wounds on and around her lips. She’d always put toothpaste on them. When I asked her she said “that’s just Herpes.” Which made me really confused back then because I did not know that you can get herpes on the lips as well. So I went to the internet and researched it. And that’s were I found out that people who have lip herpes should not share their drinks with others, since that could be enough to infect another person. So, out of the blue, I stated “ You know, I read that’s not a good Idea to let her drink from your glass.” She asked “why’s that?” I answered “Don’t you know that people with herpes shouldn’t share a drink with others? ‘Cuz of risk of infection?” She “Oh. No there is only a risk when I got these wounds. It’s perfectly fine now.” Me “You sure? I read it multiple times on different sites.”She “What are you saying? I am not allowed to kiss or touch my children? Are you forbidding me coming near my child?”Me “No, that’s not what I meant. I just read it online.”The conversation drifted then to another topic. But I wasn’t sure anymore if I remembered my “research” correctly. And since she is a trained nurse, I might’ve been in the wrong. So I went on a googling stampede again to see who was in the wrong. And, again, I found multiple different sites who said it is not a good Idea to drink from the same glass. I was a bit angry and frustrated at the fact how she accused me for telling her “she should stay away from us”. So I decided to be a petty. I made screenshots of two different websites, higlhighted the important parts and send it to her with the caption “told you so”. She replied with “thanks for the info”. Couple of days later, when it was time to drive back home, she brought it up again. “Stop searching for drama and stop disrespecting me. Just like with the herpes thing. Sending me those screenshots. Do you think I am stupid?” When we got home she brought the it up again. Saying to never disrespect her like that again. I agree I should not have brought it up in the first place. I don’t even know why I did. And it certainly wasn’t meant in a disrespectful manner. But I don’t get it why she reacts that way. I am 19 btw. AITA?