Would you like me to provide screenshots of you being a mysogynist? That can be arranged. You did not just call someone pretty. You called them a pretty girl, a chick, commented on their makeup use, and then used all of that to claim that they were too dumb to understand the topic. The topic itself? The woman, a diabetic, was doing an incredible service to the world by pointing out and making it known that Dexcom is making diabetic care harder for their clients intentionally. You then also made a very off-putting comment about well groomed boys before running off.
I will reiterate that gender and sexual orientation is not correlated to someone being a sexual abuser. Boiling it down to "they're gay and repressed so they commit crimes" is disgusting and you know it. This is not up for debate, it is not a fact. It is right wing propaganda to isolate and vilify minority groups.
Perhaps instead of using that tired and honestly offensive "minorities around me are targeted so I'll use my judgement for them" dialogue, you should shut the fuck up and actually listen to what they say. I showed your comment to several people in my very LGBTQ heavy social group today, and the consensus was that you were being a vile pig. You won't reflect on that even for a moment, though.