I agree . The only PDA I'm ok with seeing is hand holding. Outside of that, and maybe quick kisses , it's 'get a room' territory and sorta grosses me out. I was on a train last weekend and the was an older couple(30s or 40s) in the same cart as me, making out pretty intensely and necking each other. Thought that was sorta gross and weird neutral
As for myself, I try to give others the same respect I'd like in not showing much PDA. My boyfriend is a pretty private person, but still occasionally gropes or kisses me in public.