How much is too much PDA?  

I reckon as long as all the body parts are covered then they can do what they want.
I must say, I have never been disturbed by even the most bold and upfront displays of affection, in public.
But here in the UK is very different from the United Staes, and things that dont seem to really be issues with us, or most of us, do seem to be issues in America.

Why should seeing two people being affectionate in public disturb you?
And people displaying affection in public arent harming small kids are they? Dont yuou think that sometimes we can be just a wee bit over protective

I think we will probably best agree to differ on this, lol

I completely agree with you. That type of behavior is really too much in public. Sorry I can't elaborate more, you pretty much expressed my feelings on the matter to a tee.

I think PDA is too much if it inappropriate for the kids to see it. Public places are for everyone including the little ones. Imagine your kid actually seeing 2 people kissing torridly and doing their act, it could be shocking for them. If you want to do your thing and cannot control yourself, go to a private area where it should it done. A smack, holding hands, quick kiss are something little kids can manage to see.

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hugging kissing and cuddling is fine in public in my eyes. It's when the clothing is getting ripped off and the grouping is going on is when its inappropriate and not just for children to see. Your experience must have been close to this for security to get involved.
There are plenty though that think even kissing and putting arms around each other is wrong. I just had a woman make a very nasty remark to me just a few weeks ago in the grocery store because my fiance and I had our arms wrapped around each others waist pushing a cart we gave each other a quick kiss and she had a fit right there. It was a 2 second peck not some long drawn out french kiss or anything.
All I could say as passing by was "What ashame that not everyone is happy and have let love into their lives. its just so sad." Oh I wanted to say so much more but that must have been good enough because she went storming off and wasnt heard from anymore.

I think people going all out in a small public place is bad, if the area is large then i believe others can avert their eyes. But there is limits, for myself i hate too much because it makes me uncomfortable. But too each their own.