Am I a great asshole for throwing my friend into the pool?

So yesterday my best friend R had a barbecue&pool party at her house and invited me, my girlfriend and some other friends that we know each other since birth. During the party we started a water fight , with water balloons and some of us enjoyed while others were sitting down and eating drinking etc. I threw some of my friends playfully in the pool (a plastic one) and after a while a lifted a friend of my best friend, that I know for many years too and threw her in the pool with clothes , after I made sure she hasn't had her phone or any device that could be destroyed on her. She got out of the pool and threw me a flip flop playfully to get back at me for throwing her into the pool. Then, I offered her my towel and after she changed clothes I smiled at her and she did a heart with her fingers to me. When we got home with my girlfriend, she told me that I shouldn't have thrown my friend into the pool without her consent and I felt terribly immediately. It wasn't my intention to harm her in any way, I just wanted to create a playful mood. So then, I texted my best friend who hosted the gathering to tell her about she told me that it's okay, and that it doesn't matter. Am I a big asshole? I feel terribly.

Am I a great asshole for throwing my friend into the pool?
Post Opinion