Am I a groomer?

I'm currently in a mental health group and things got heated today because I was called a groomer by one of the girls there. When I was 26 me and my friends hung out with a lot of teenagers. I'm not proud to admit this but we gave them alcohol and smoked weed with the. One of my biggest regrets was I was on a couch sitting next to a boy who was between 14 and 16 and gave him a cup of whiskey. He said he's underage and I said I didn't ask that. It wasn't sexual at all! It was me being fucking stupid and the girl in the group went off on me and called me and my old friends groomers. I spoke to my sister about it and she asked me questions like if I had sex or planned to have sex with any of them and I said of course not. Asked me if I helped my friends get laid by any of those teens and I said of course not and asked if we gave them any hard core drugs and I said only weed. She told me grooming had to have intent to abuse. She told me from what she's hearing from me that while there was a bunch of irresponsibility on our part that it doesn't sound like at least I had an intent to abuse. She did tell me as the adult in the situation what I did was extremely inappropriate. I could have been charged with child endangerment and I should have not had minors in that situation but she doesn't consider it grooming. She's my sister though so she could have been trying to make me feel better. I want outside opinion from other people who don't know me.