During my freshmen year in high school, there was PDA at my every turn. It was a little odd to me, because I had just got out of a middle school where it never happened, nor was it tolerated by that particular school district (not to mention, people in middle school tend to be 10-14 years old, maybe younger if they're gifted), so being in an environment where PDA happened all the time was definitely new for me. Overtime, it no longer fazed me. Now, I'm very nonchalant about it. Personally, in my own relationships, holding hands, hugging, and a kiss here and there is fine. No need to give people the impression that you're on the verge of having public sex.
Regular PDA I don't really care tbh I'm happy you guys have each other just don't penetrate each other next to me.
When I was in HS there was this couple that would sit at the same lunch table as me, and they'd full on make out and grope each other and then they'd look over at me and laugh, like hunties I'm not into this. I don't want to see you doing this. You're forcing it on me. I need an adult