Ditto!!IOh and the not washing their hands after using a public toilet is also really icky.
I notice a lot of Dutch women don't do it and actually had an argument with a PhD canidiate (rocket science no less! Honest!), and she said there was no scientific proof it had any value...:W-T-F?: I use tissue to open the doors on my way out and don't get me started about shaking hands...Ewwww!~
I will vouch for the Brits on their queuing, they are awesome at it
I haven't encountered poorly behaved European tourists... the only thing that surprised me (and I guess this doesn't really happen when they tour in the U.S.) is how frequently they'll correct your language. Almost everytime I made a mistake in French, it was pointed out to me (making it pretty difficult to get through a conversation), but for them, they don't think it's rude but rather, they think they're being helpful. Which really, for someone trying to learn, they are!
Yes, a very helpful, but frustrating trait!